Standard Ignition PS-256 Engine Oil Pressure Switch
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Standard Ignition

Standard Ignition PS-256 Engine Oil Pressure Switch

Brand Standard Ignition PS-256
Connector Gender Male
Terminal Gender Male
Terminal Type Blade
Fits Chevrolet, GMC, Buick, Cadillac, Oldsmobile, and Pontiac · 81 vehicles

High-accuracy sensing. Laser-calibrated circuitry reads oil pressure precisely.

Durable diaphragm design. Polyimide construction resists rupture and oil leakage.

Service-ready testing. Each unit is 100% tested for leaks and specification compliance.

Cross-references Anchor 8128, 1S6652 and 2-8128 for the same application. See all 14.

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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.

Related reading

This part fits 81 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
1991ChevroletC15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1991ChevroletC25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1991ChevroletC35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1991ChevroletK15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1991ChevroletK25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1991ChevroletK35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1991GMCC15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1991GMCC25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1991GMCC35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1991GMCK15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1991GMCK25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1991GMCK35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990ChevroletC15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990ChevroletC25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990ChevroletC35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990ChevroletK15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990ChevroletK25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990ChevroletK35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990GMCC15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990GMCC25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990GMCC35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990GMCK15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990GMCK25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1990GMCK35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989ChevroletC15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989ChevroletC25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989ChevroletC35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989ChevroletK15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989ChevroletK25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989ChevroletK35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989GMCC15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989GMCC25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989GMCC35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989GMCK15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989GMCK25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1989GMCK35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988ChevroletC15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988ChevroletC25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988ChevroletC35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988ChevroletK15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988ChevroletK25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988ChevroletK35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988ChevroletS102.8LV6N/Aw/ Rally Gauge Package; Gauge
1988ChevroletS102.5LL4N/ACompatible with engines that have oil pressure gauges.
1988ChevroletS10 Blazer2.5LL4N/ACompatible with engines that have oil pressure gauges.
1988ChevroletS10 Blazer2.8LV6N/Aw/ Rally Gauge Package; 3 Term.; Gauge
1988GMCC15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988GMCC25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988GMCC35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988GMCK15006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988GMCK25006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988GMCK35006.2LV8N/ACompatible with engines that have oil pressure gauges.
1988GMCS152.5LL4N/ACompatible with engines that have oil pressure gauges.
1988GMCS152.8LV6N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1988GMCS15 Jimmy2.5LL4N/ACompatible with engines that have oil pressure gauges.
1988GMCS15 Jimmy2.8LV6N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1987ChevroletS102.5LL4N/ACompatible with engines that have oil pressure gauges.
1987ChevroletS102.8LV6N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1987ChevroletS10 Blazer2.5LL4N/ACompatible with engines that have oil pressure gauges.
1987ChevroletS10 Blazer2.8LV6N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1987GMCS152.8LV6N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1987GMCS152.5LL4N/ACompatible with engines that have oil pressure gauges.
1987GMCS15 Jimmy2.5LL4N/ACompatible with engines that have oil pressure gauges.
1987GMCS15 Jimmy2.8LV6N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1986ChevroletS102.8LV6N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1986ChevroletS102.5LL4N/ACompatible with engines that have oil pressure gauges.
1986ChevroletS10 Blazer2.8LV6N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1986ChevroletS10 Blazer2.5LL4N/ACompatible with engines that have oil pressure gauges.
1986GMCS152.8LV6N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1986GMCS152.5LL4N/ACompatible with engines that have oil pressure gauges.
1986GMCS15 Jimmy2.5LL4N/ACompatible with engines that have oil pressure gauges.
1986GMCS15 Jimmy2.8LV6N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1984ChevroletCorvette——N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1983BuickSkyhawk2.0LL4N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1983CadillacCimarron——N/ACompatible with engines that have oil pressure gauges.
1983ChevroletCamaro5.0LV8N/Aw/ 80 PSI Gauge; 3 Term.; Gauge
1983ChevroletCavalier——N/ACompatible with engines that have oil pressure gauges.
1983OldsmobileFirenza2.0LL4N/ACompatible with engines that have oil pressure gauges.
1983PontiacJ20002.0LL4N/ACompatible with engines that have oil pressure gauges.
1982ChevroletCamaro5.0LV8N/AEngine Oil Pressure Switch fits vehicles with 3 Term Gauge
1982ChevroletCorvette——N/ACompatible with engines that have oil pressure gauges.
Directly replaces or cross-references 14 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Anchor — 81281S66522-812853-336045012751013760314039603OP6717OP6717SBPS186PS252PS256TS4146SBC1171