Oil preassure Gauge

Anyone know of a writeup on how to rebuild an oil preassure gauge from a 74? I think they only used this particular model from 72-74. 75+ looks different. I tested it last night and it is dead (just pegs at 80psi). The sending unit works fine (tested that as well). Or does anyone have one for sale??

-Andy

 

Maybe you could take the works and needle from a new one and use the dial, case and bezel from the old one? Either that or replace it with a spiffy 270 degree sweep S-W mechanical type.

 

Ok say I took the guts out of a newer one and put them into my gauge like you said. Do I need to replace the sending unit? I know they list a different one for 75+ but what is the difference?

 

Yeah, the sender goes with the works. Might be just a minor difference, but it's so easy to change you may as well use the right sender.

The FSM should list the characteristics of the sending unit; you need them for testing. I know they list the resistances for the temperature sending unit, and I thought they listed something similar for the oil pressure sending unit. You could compare the listed values between the '74 FSM and a later FSM.

 

Yeah I used the resistance measurements from the FSM to test the old gauge. I guess I could do that. I think I will hunt for a used gauge for a little while. If I don't find one I will buy a new SW. I should be able to find something similar to what I've got.