oil light on at freeway speed

Have you temporarily replaced the pressure-sending unit with an oil pressure gauge and verified pressure is okay? If so, then I'm guessing a loose connection at the dashboard end, only because I've heard of that happening. My understanding is that the sending units are fairly simple and don't do bad very easily. The sending units used to be very cheap, but getting it out requires a deep socket.

Beverly

Sometimes the insulation in the vicinity of the sender can abrade by rubbing against a chassis. Eventually the wire inside will complete a circuit to ground which will turn on the oil light. Oil pressure sender works the same way by grounding that wire at low pressure.

Regards,

Boris Mohar

Got Knock? - see: Viatrack Printed Circuit Designs (among other things)

I will try that. I suppose an 02 socket should work. Thank you.

I will take a look at that insulation too. I had a 1952 MGTD that used to do that when the tac shimied where it entered the distributor housing, drove me nuts. Thanks

Unless it's been fixed before, the insulation is certainly ratty at this point, the whole wiring harness tends to disintegrate within the outer sheath, they corrected this in the late 80s.

Yea, I thought I caught that somewhere before. I bought this car for $450, put new brakes, rotors, etc. on it and cleaned it up nice and am going to give it to a friend of mine. He is getting on in years so I want to make sure I don't turn him into a involuntary mechanic or worry him half to death every time he gets on a freeway.