factory oil pressure guage - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nascarmikeb · 10-08-2012, 01:59 PM

Truck is an 87 GMC R1500. stock engine was 305 TBI, which was blown upon purchase. I put in an 85 305 block which was using an aftermarket mechanical oil pressure guage.

When I put in my 350, I just remained with the aftermarket mechanical guage, connected behind the distributor. Now, I am wanting to go back w/ factory oil pressure guage in the guage cluster. But I am not sure what wire I am looking for coming out of my harness & where on the block will it connect?

Any help is appreciated.

Mike

nascarmikeb · 10-08-2012, 02:40 PM

Update,

I saw on a wiring diagram that the oil pressure switch is a single tan wire. After inspecting my factory harness, I found a single tan wire, hanging directly behind the dizzy. The terminal is a female spade clip. The wire is not very long maybe 8-10 inches off the main harness, long enough to plug into something around the dizzy area.

Am i in the right area?

Mike

chebyshortbox65 · 10-08-2012, 02:52 PM

That should be the one
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Dead Parrot · 10-08-2012, 05:33 PM

You will have to get the appropriate sending unit. It will screw in the place where your existing mechanical gauge tube goes, behind the distributor. Make sure you get a sending unit for a gauge, as the idiot light sending unit goes in the same place.

nascarmikeb · 10-08-2012, 06:49 PM

Ok so that was the correct wire
I may not have the correct sending unit as my pressure fluctuates
I know I have good pressure
This one is shaped like a bell
I wonder if there are ones for different yr 350 blocks
Posted via Mobile Device

Your41Plague12 · 10-09-2012, 06:30 PM

Quote:

Originally Posted by nascarmikeb

Ok so that was the correct wire
I may not have the correct sending unit as my pressure fluctuates
I know I have good pressure
This one is shaped like a bell
I wonder if there are ones for different yr 350 blocks
Posted via Mobile Device

That sounds like the correct sending unit, and the pressure should most likely fluctuate with RPM. If you romp on it, does the pressure go up? What does it idle at, and what does it go up to if you give it a lot of gas?

motornut · 10-09-2012, 06:35 PM

this is the one I got for my 350 in my 78.....neither stock i had idot lights before

tylervalo · 10-09-2012, 07:06 PM

I've got some adapter on mine where I can run 2 gauges, I've got a mech automater and the factory electric.
Posted via Mobile Device

10-08-2012, 01:59 PM	#1
nascarmikeb Registered User Join Date: Feb 2011 Location: Lake Charles, LA Posts: 61	factory oil pressure guage Truck is an 87 GMC R1500. stock engine was 305 TBI, which was blown upon purchase. I put in an 85 305 block which was using an aftermarket mechanical oil pressure guage. When I put in my 350, I just remained with the aftermarket mechanical guage, connected behind the distributor. Now, I am wanting to go back w/ factory oil pressure guage in the guage cluster. But I am not sure what wire I am looking for coming out of my harness & where on the block will it connect? Any help is appreciated. Mike

10-08-2012, 02:40 PM	#2
nascarmikeb Registered User Join Date: Feb 2011 Location: Lake Charles, LA Posts: 61	Re: factory oil pressure guage Update, I saw on a wiring diagram that the oil pressure switch is a single tan wire. After inspecting my factory harness, I found a single tan wire, hanging directly behind the dizzy. The terminal is a female spade clip. The wire is not very long maybe 8-10 inches off the main harness, long enough to plug into something around the dizzy area. Am i in the right area? Mike

10-08-2012, 02:52 PM	#3
chebyshortbox65 Registered User Join Date: Nov 2011 Location: yucca valley,ca Posts: 206	Re: factory oil pressure guage That should be the one Posted via Mobile Device

10-08-2012, 05:33 PM	#4
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,521	Re: factory oil pressure guage You will have to get the appropriate sending unit. It will screw in the place where your existing mechanical gauge tube goes, behind the distributor. Make sure you get a sending unit for a gauge, as the idiot light sending unit goes in the same place.

10-08-2012, 06:49 PM	#5
nascarmikeb Registered User Join Date: Feb 2011 Location: Lake Charles, LA Posts: 61	Re: factory oil pressure guage Ok so that was the correct wire I may not have the correct sending unit as my pressure fluctuates I know I have good pressure This one is shaped like a bell I wonder if there are ones for different yr 350 blocks Posted via Mobile Device

10-09-2012, 06:35 PM	#7
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: factory oil pressure guage this is the one I got for my 350 in my 78.....neither stock i had idot lights before Attached Images __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

10-09-2012, 07:06 PM	#8
tylervalo Registered User Join Date: Sep 2011 Location: Knoxville, Tn Posts: 408	Re: factory oil pressure guage I've got some adapter on mine where I can run 2 gauges, I've got a mech automater and the factory electric. Posted via Mobile Device



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