oil pressure gauge and sender - The 1947 - Present Chevrolet & GMC Truck Message Board Network

johnwaynejeep · 12-23-2015, 04:17 PM

I've poured through the tech links and I can't find an answer on this

I'm replacing my oil pressure sender and I wanted to know if I'm getting the right combination of gauge and sender since some gauges require a specific resistance. Can anyone tell me if I'm getting the right combination? part numbers listed below.

thanks all
Robert

Oil pressure sender: http://www.napaonline.com/Catalog/Ca...640_0167106906

Oil pressure gauge: http://www.classicparts.com/1978-87-.../#.VnsBOE1dN7g

ray_mcavoy · 12-24-2015, 08:25 PM

What you have picked out there is a replacement of the factory style 60psi sending unit and a reproduction gauge. Unfortunately, I don't see any specs listed for the gauge but 60psi was the most common so there is a good chance that it is compatible.

However, you are also dealing with replacement/reproduction parts and there are cases where their specs don't always match up with the original GM parts. For example, many of the replacement temperature sending units don't have the correct temperature vs. resistance curve to give an accurate reading on the stock gauge.

As for the resistance, I believe all of the GM oil pressure sending units (for this year range of trucks) have a resistance near or at zero when the pressure is near or at zero. And they all go up to approximately 90Ω at their max indicating pressure.

It's the max pressure where they differ. A gauge that reads up to 60psi was the most common in pickup trucks and needs to be paired with a sending unit that will be at 90Ω @ 60psi. Gauges that read up to 80psi and 100psi were used in some applications (mostly diesel engines) and need to be paired with corresponding sending units that will be at 90Ω @ 80psi (or @ 100 psi respectively).

**hatzie** · 12-24-2015, 11:57 PM

The nice thing about the fact that they are all 0-90ohm senders is you can re-face the gauge to 80 or 100psi and get the proper corresponding sender.

johnwaynejeep · 01-08-2016, 08:36 PM

thanks for the input. I know some people have had problems with matching sending units to gauges and this makes perfect sense now.

Hopefully I'll remember to update you after I put the engine back in and test it out.

Take care

12-23-2015, 04:17 PM	#1
johnwaynejeep Registered User Join Date: Jul 2014 Location: Pacific Grove, CA Posts: 105	oil pressure gauge and sender I've poured through the tech links and I can't find an answer on this I'm replacing my oil pressure sender and I wanted to know if I'm getting the right combination of gauge and sender since some gauges require a specific resistance. Can anyone tell me if I'm getting the right combination? part numbers listed below. thanks all Robert Oil pressure sender: http://www.napaonline.com/Catalog/Ca...640_0167106906 Oil pressure gauge: http://www.classicparts.com/1978-87-.../#.VnsBOE1dN7g __________________ Robert 1975 C10 - Huckleberry 2007 Jeep JK - John Wayne Jeep Smittybilt front/rear bumper, 10K winch Pacific Grove, CA

12-24-2015, 08:25 PM	#2
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,366	Re: oil pressure gauge and sender What you have picked out there is a replacement of the factory style 60psi sending unit and a reproduction gauge. Unfortunately, I don't see any specs listed for the gauge but 60psi was the most common so there is a good chance that it is compatible. However, you are also dealing with replacement/reproduction parts and there are cases where their specs don't always match up with the original GM parts. For example, many of the replacement temperature sending units don't have the correct temperature vs. resistance curve to give an accurate reading on the stock gauge. As for the resistance, I believe all of the GM oil pressure sending units (for this year range of trucks) have a resistance near or at zero when the pressure is near or at zero. And they all go up to approximately 90Ω at their max indicating pressure. It's the max pressure where they differ. A gauge that reads up to 60psi was the most common in pickup trucks and needs to be paired with a sending unit that will be at 90Ω @ 60psi. Gauges that read up to 80psi and 100psi were used in some applications (mostly diesel engines) and need to be paired with corresponding sending units that will be at 90Ω @ 80psi (or @ 100 psi respectively).

12-24-2015, 11:57 PM	#3
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: oil pressure gauge and sender The nice thing about the fact that they are all 0-90ohm senders is you can re-face the gauge to 80 or 100psi and get the proper corresponding sender. __________________ 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.

01-08-2016, 08:36 PM	#4
johnwaynejeep Registered User Join Date: Jul 2014 Location: Pacific Grove, CA Posts: 105	Re: oil pressure gauge and sender thanks for the input. I know some people have had problems with matching sending units to gauges and this makes perfect sense now. Hopefully I'll remember to update you after I put the engine back in and test it out. Take care __________________ Robert 1975 C10 - Huckleberry 2007 Jeep JK - John Wayne Jeep Smittybilt front/rear bumper, 10K winch Pacific Grove, CA

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