Have been having problems with the 80lb oil pressure senders in my '67. Now on my third, they seem to work OK for a while then suddenly go haywire. One registered lower than correct pressure the other two always read 70-80 psi. Verified with an Autometer mech gauge. I'd like to check out the circuitry from the sender to the gauge so I need to know for the dash unit what is the resistance is at 20, 40 and 80 psi? Who makes a reliable sender for the factory 80 psi oil pressure gauge?
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