The Stovebolt Site Forums The Parking Lot '60-'66 Trucks Oil pressure gauge at dash cluster

Does OEM mean you bought a donor gauge cluster from a 66 Chevy truck? I assume you do not know if your gauge is electrical (wire terminal on the back or mechanical (a tube attached in the back). What does OEM mean to you?

If you have a 66 cluster and a 74 motor, it may be hard to match an original electrical gauge to 74 sender. You would use a sender for the 66 gauge. A mechanical gauge does not care what motor it is in, so no problem there.

This situation (66/74 mismatch) can also occur with temperature gauge/sender.

I see you posted while I was typing. Looks like you have a donor cluster with a mechanical gauge. Just buy a tube kit and install. There is NO adapter to turn the mechanical gauge to an electric gauge.