1966-1967 Jeep CJ5A Engine Oil Pressure Switch & Sender Guide
Understanding the simple but vital oil pressure switch in your classic Jeep CJ5A.
- A faulty oil pressure switch is a very common and simple-to-fix issue on a classic CJ5A.
- Always check your oil level first if you get a low-pressure warning.
- Confirm whether your Jeep has a warning light (switch) or a gauge (sender) before buying a replacement.
- For this vintage vehicle, a quality aftermarket brand like Standard Ignition is a reliable and practical choice.
Is Your Oil Pressure Light On or Gauge Acting Strange?
For a classic vehicle like the 1966-1967 Jeep CJ5A, the oil pressure switch is a straightforward component, but it's essential for engine health. A failing switch can cause significant worry, often making you think you have a serious engine problem when the sensor is simply worn out. Common symptoms include an oil pressure warning light that stays on, or a gauge that reads zero or acts erratically. It's also a potential source for small oil leaks from the sensor body itself.
Don't Ignore the Warning
While a faulty switch is a common issue on older Jeeps, you should never ignore a low oil pressure warning. Always check your engine oil level first. If the oil level is correct, it's wise to verify the actual oil pressure with a mechanical gauge before assuming the switch is the only problem. A true loss of oil pressure can destroy an engine very quickly.
Choosing an Aftermarket Switch for Your CJ5A
Finding a "New Old Stock" (NOS) or original OEM part from the 1960s is nearly impossible. For a simple, non-computerized part like an oil pressure switch on a vintage CJ5A, a quality aftermarket replacement is the standard and most practical choice. Brands like Standard Ignition (also known as Standard Motor Products or SMP) are well-established in the aftermarket and produce reliable replacement parts that meet or exceed the original specifications for this type of simple electronic switch. Given the simplicity of the part, there is generally no significant quality difference between OEM and a reputable aftermarket brand for this application.
Estimated Costs
| New Aftermarket Switch | $16.58 - $19.61 |
| Shop Labor | $50 - $100 |
| New OEM / NOS | Not commonly available |
Frequently Asked Questions
Where is the oil pressure switch located on a 1966-1967 CJ5A?
The oil pressure switch is typically screwed into the engine block. On the F-134 "Hurricane" engine, it is often found on the driver's or passenger's side of the block, sometimes near the oil filter or distributor. It will look like a small metal canister with a single electrical connection.
Is this a switch for a light or a sender for a gauge?
The 1966-1967 CJ5A could be equipped with either a simple warning light or a full pressure gauge. A "switch" is for a light (on/off signal), while a "sending unit" or "sender" is for a gauge (variable signal). It is crucial to order the correct part that matches your vehicle's dashboard setup. The parts look similar but function differently.
Can I replace the oil pressure switch myself?
Yes, this is a very simple DIY job for a home mechanic. It typically requires only basic hand tools, such as a wrench or a special socket, and can be completed in under 30 minutes. Just locate the old switch, disconnect the wire, unscrew it, apply thread sealant to the new switch, and install it.
Are there any recalls or TSBs for the CJ5A oil pressure switch?
Searches of the National Highway Traffic Safety Administration (NHTSA) database and other records show no recalls or Technical Service Bulletins (TSBs) for the engine oil pressure switch on the 1966-1967 Jeep CJ5A. This is expected for a vehicle of this age and for a part considered a common wear item.
Technical Specifications
Varies based on whether the vehicle is equipped with an oil pressure warning light or a gauge. The switch for a light is a simple on/off circuit, while a sender for a gauge is a variable resistor. The electrical connection is typically a single screw or push-on terminal.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.