NOS Sorensen PS-28 Oil Pressure Switch – USA Made
Description:
Correct for 1956–69 GM V8 platforms (excluding 348/409 CID). Cross-referenced with GP Sorensen OPS28, Standard PS-12, and Delco D1800. Short stem, single terminal – activates dash light at low oil pressure. NOS condition – includes original packaging – not a reproduction
⚙️ Part Overview
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Manufacturer: Sorensen (Standard Motor Products)
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Part Number: PS-28
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Type: Oil pressure switch
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Design: Single terminal, short stem, threaded body
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Function: Activates warning light when oil pressure drops below threshold
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Country of Origin: USA
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Packaging: Typically boxed; NOS units may show shelf wear or be bundled in multi-part lots
🚗 Fitment & Specific Applications
The PS-28 is correct for GM platforms from 1956–1969, especially V8 engines excluding 348 and 409 CID. Based on verified interchange data and catalog listings:
| Make | Models (Typical) | Years | Engine Types |
|---|---|---|---|
| Chevrolet | Bel Air, Impala, Biscayne | 1956–1969 | 265, 283, 327, 350 V8 |
| Pontiac | Catalina, Bonneville | 1960s | V8 platforms |
| Buick | LeSabre, Electra | 1960s | Nailhead V8 |
| Oldsmobile | Cutlass, Delta 88 | 1960s | Rocket V8 |
This switch is typically mounted near the oil filter boss or rear block port and used in dash warning light systems—not gauge circuits.
🔁 Cross-Reference Numbers
| Brand | Part Number |
|---|---|
| Sorensen | PS-28 |
| GP Sorensen | OPS28 / OP6065 |
| Niehoff | DR-133B |
| Standard | PS-12 |
| Delco | D1800 |
| Borg Warner | S318 |
| NAPA Echlin | OP7X |
These interchange numbers reflect compatibility across multiple aftermarket brands for short-stem GM-style oil pressure switches
