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**hatzie** · 06-18-2016, 07:51 PM

Be careful
GM oil pressure gauge senders are 0Ω=0PSI and 90Ω=max PSI.
Autometer, like the 1.5" gauge on my ATV, uses senders where 235Ω=0PSI and 0Ω=max PSI. Not sure who makes the Summit gauges but it appears they may be Autometer units or clones.

The way to be sure is to test the Ohmage with the sender installed and the engine running or with the sender installed on a pressure source.
It's a pressure transducer that converts pressure into resistance... There's no rule that says you can't screw the sender into a female thread Milton air hose disconnect fitting and attach it to your compressor hose, with the air hose regulator dialed down to between 30 & 60PSI or so, and observe what the ohmage does.

06-18-2016, 07:51 PM	#4204
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,922	Re: Restoring Rusty Be careful GM oil pressure gauge senders are 0Ω=0PSI and 90Ω=max PSI. Autometer, like the 1.5" gauge on my ATV, uses senders where 235Ω=0PSI and 0Ω=max PSI. Not sure who makes the Summit gauges but it appears they may be Autometer units or clones. The way to be sure is to test the Ohmage with the sender installed and the engine running or with the sender installed on a pressure source. It's a pressure transducer that converts pressure into resistance... There's no rule that says you can't screw the sender into a female thread Milton air hose disconnect fitting and attach it to your compressor hose, with the air hose regulator dialed down to between 30 & 60PSI or so, and observe what the ohmage does. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 06-18-2016 at 08:01 PM.