/live/media/SI/SI_PS256_Fro.jpg)
OE Quality
60-Day Returns
Standard IgnitionPart #: PS-256
Standard Ignition PS-256 Engine Oil Pressure Switch
81 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$64.45Free Shipping
Free ShippingNo Cost to Continental U.S.
Free Returns*Wrong fit? No cost
60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
In Stock · Ready To Ship
Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Chevrolet, GMC, Buick, Cadillac, Oldsmobile, and Pontiac, C1500, C2500, C3500, K1500, K2500, K3500, S10, S10 Blazer, S15, S15 Jimmy, Corvette, Skyhawk, Cimarron, Camaro, Cavalier, Firenza, and J2000
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? See all Engine Oil Pressure Switch options
Engine Oil Pressure Switch for Gauge Applications
Standard Ignition PS-256 is an engine oil pressure switch built for vehicles that use an oil pressure gauge or 3-terminal gauge circuit. It is engineered for accurate pressure reading, stable electrical response, and dependable operation in demanding engine environments.
- Male connector and male blade terminals
- 3-terminal design for gauge applications
- High-temperature polyimide film diaphragm construction
- Built to withstand rapid pressure pulsations
- 100% tested for activation and leak checking
Fitment and Application Details
Fits 1988-1991 Chevrolet C1500, gauge applications; 1988-1991 Chevrolet C2500, gauge applications; 1988-1991 Chevrolet C3500, gauge applications; 1988-1991 Chevrolet K1500, gauge applications; 1988-1991 Chevrolet K2500, gauge applications; 1988-1991 Chevrolet K3500, gauge applications. Fits 1988-1991 GMC C1500, gauge applications; 1988-1991 GMC C2500, gauge applications; 1988-1991 GMC C3500, gauge applications; 1988-1991 GMC K1500, gauge applications; 1988-1991 GMC K2500, gauge applications; 1988-1991 GMC K3500, gauge applications.
- Fits 1988 Chevrolet S10, w/ Rally Gauge Package; Gauge
- Fits 1988 Chevrolet S10 Blazer, w/ Rally Gauge Package; 3 Term.; Gauge
- Fits 1986-1988 Chevrolet S10, gauge applications
- Fits 1986-1988 Chevrolet S10 Blazer, gauge applications
- Fits 1986-1988 GMC S15, gauge applications
- Fits 1986-1988 GMC S15 Jimmy, gauge applications
- Fits 1984 Chevrolet Corvette, 3 Term Gauge
- Fits 1983 Buick Skyhawk, 3 Term Gauge
- Fits 1983 Cadillac Cimarron, gauge applications
- Fits 1983 Chevrolet Camaro, w/ 80 PSI Gauge; 3 Term.; Gauge
- Fits 1983 Chevrolet Cavalier, gauge applications
- Fits 1983 Oldsmobile Firenza, gauge applications
- Fits 1983 Pontiac J2000, gauge applications
- Fits 1982 Chevrolet Camaro, 3 Term Gauge
- Fits 1982 Chevrolet Corvette, gauge applications
What This Switch Helps Address
- Inaccurate or erratic oil pressure gauge readings
- Oil pressure warning or gauge circuit faults
- Intermittent signal loss at the gauge connector
- Leaks caused by a worn or ruptured switch diaphragm
- Switch failure from repeated pressure pulsation exposure
Installation Notes and Tips
Verify the vehicle uses a 3-terminal oil pressure gauge setup before ordering. Confirm connector style, terminal count, and application notes against the original part. This part cross-references AC Delco 1S6652 for the same application.
Quality Assurance
Standard Ignition uses laser-etched calibration for accurate oil pressure reading and high-temperature diaphragm materials for durability. Each unit is tested with automated equipment for activation and leak detection to help confirm specification compliance under demanding operating conditions. Part number PS-256 is built to meet the needs of professional engine service work.
| Brand | Standard Ignition |
|---|---|
| Part Number | PS-256 |
| Connector Gender | Male |
| Terminal Gender | Male |
| Terminal Type | Blade |
This part fits 81 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1991 | Chevrolet | C1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1991 | Chevrolet | C2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1991 | Chevrolet | C3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1991 | Chevrolet | K1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1991 | Chevrolet | K2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1991 | Chevrolet | K3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1991 | GMC | C1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1991 | GMC | C2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1991 | GMC | C3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1991 | GMC | K1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1991 | GMC | K2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1991 | GMC | K3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | Chevrolet | C1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | Chevrolet | C2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | Chevrolet | C3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | Chevrolet | K1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | Chevrolet | K2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | Chevrolet | K3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | GMC | C1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | GMC | C2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | GMC | C3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | GMC | K1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | GMC | K2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1990 | GMC | K3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | Chevrolet | C1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | Chevrolet | C2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | Chevrolet | C3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | Chevrolet | K1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | Chevrolet | K2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | Chevrolet | K3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | GMC | C1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | GMC | C2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | GMC | C3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | GMC | K1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | GMC | K2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1989 | GMC | K3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | Chevrolet | C1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | Chevrolet | C2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | Chevrolet | C3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | Chevrolet | K1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | Chevrolet | K2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | Chevrolet | K3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | Chevrolet | S10 | 2.8L | V6 | N/A | w/ Rally Gauge Package; Gauge |
| 1988 | Chevrolet | S10 | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | Chevrolet | S10 Blazer | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | Chevrolet | S10 Blazer | 2.8L | V6 | N/A | w/ Rally Gauge Package; 3 Term.; Gauge |
| 1988 | GMC | C1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | GMC | C2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | GMC | C3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | GMC | K1500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | GMC | K2500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | GMC | K3500 | 6.2L | V8 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | GMC | S15 | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | GMC | S15 | 2.8L | V6 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1988 | GMC | S15 Jimmy | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1988 | GMC | S15 Jimmy | 2.8L | V6 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1987 | Chevrolet | S10 | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1987 | Chevrolet | S10 | 2.8L | V6 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1987 | Chevrolet | S10 Blazer | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1987 | Chevrolet | S10 Blazer | 2.8L | V6 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1987 | GMC | S15 | 2.8L | V6 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1987 | GMC | S15 | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1987 | GMC | S15 Jimmy | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1987 | GMC | S15 Jimmy | 2.8L | V6 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1986 | Chevrolet | S10 | 2.8L | V6 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1986 | Chevrolet | S10 | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1986 | Chevrolet | S10 Blazer | 2.8L | V6 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1986 | Chevrolet | S10 Blazer | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1986 | GMC | S15 | 2.8L | V6 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1986 | GMC | S15 | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1986 | GMC | S15 Jimmy | 2.5L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1986 | GMC | S15 Jimmy | 2.8L | V6 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1984 | Chevrolet | Corvette | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge | ||
| 1983 | Buick | Skyhawk | 2.0L | L4 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1983 | Cadillac | Cimarron | N/A | Compatible with engines that have oil pressure gauges. | ||
| 1983 | Chevrolet | Camaro | 5.0L | V8 | N/A | w/ 80 PSI Gauge; 3 Term.; Gauge |
| 1983 | Chevrolet | Cavalier | N/A | Compatible with engines that have oil pressure gauges. | ||
| 1983 | Oldsmobile | Firenza | 2.0L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1983 | Pontiac | J2000 | 2.0L | L4 | N/A | Compatible with engines that have oil pressure gauges. |
| 1982 | Chevrolet | Camaro | 5.0L | V8 | N/A | Engine Oil Pressure Switch fits vehicles with 3 Term Gauge |
| 1982 | Chevrolet | Corvette | N/A | Compatible with engines that have oil pressure gauges. |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
10137603140396031S66522-812850127553-336048128OP6717OP6717SBPS186PS252PS256TS4146SBC1171
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.