73 electric gauge in 71 dash cluster - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**K10-Kansas** · 07-12-2023, 03:23 PM

Edit: It's actually a 78-79 electric oil gauge in a 1971 K10. I think I have the wiring correct now but perhaps the ADO-D8034 sending unit is the wrong sending unit.

Hi. I've put an electric gauge in my 67-72 dash cluster. I assume 1 post in negative, one is positive, and the other is for the sending unit. I thought about trying random setups but felt I should get advice first.

**hatzie** · 07-12-2023, 07:21 PM

Temp gauge I presume.
Look up the 1973 wiring diagrams. The cluster layout is on the first page of diagrams.

**K10-Kansas** · 07-31-2023, 08:15 PM

Quote:

Originally Posted by hatzie

Temp gauge I presume.
Look up the 1973 wiring diagrams. The cluster layout is on the first page of diagrams.

Sorry, it's the oil gauge. Thanks for the link. It looks like based on the manual, the ground is in the middle.

**K10-Kansas** · 07-31-2023, 08:17 PM

I found this picture in another thread. Someone trying to work out the same question.

**K10-Kansas** · 07-31-2023, 08:19 PM

Here's my current setup. The brown is ground. Pink is 12v. I don't see colors very well so I'm guessing that's pink. My blue is the sending unit wire. The oil is showing running high. I bet that's not accurate. If I flip the 12v and sending wire it sends the needle all the way to high past 60.

**K10-Kansas** · 07-31-2023, 08:42 PM

I'm using an ACDelco Oil Pressure Sending Unit that I realized today doesn't list 78-79 c10 as a fit. It does list 1977 https://www.summitracing.com/parts/A...4/applications

I am using a gauge for 78-79 c10 https://www.lmctruck.com/1973-91-che...pressure-gauge

Is it reading high because I bought the wrong sending unit?

This one shows a 78-79 c10 as a fit https://www.summitracing.com/parts/s.../c10/year/1978

So maybe the make and model of the vehicle doesn't matter in relation to the engine dictating what sending unit to use but instead, the make and model of the vehicle dictating what sending unit to use per the gauge that was in that make and model?

Dead Parrot · 08-01-2023, 03:30 PM

That oil pressure is a near match for what my 75 with a stock 350 shows when at speed. OEM mechanical gauge. Disclaimers - sample size of 1 and ~48 year old gauge.

**K10-Kansas** · 08-01-2023, 04:59 PM

Quote:

Originally Posted by Dead Parrot

That oil pressure is a near match for what my 75 with a stock 350 shows when at speed. OEM mechanical gauge. Disclaimers - sample size of 1 and ~48 year old gauge.

My value was at idle 3 minutes after starting it. So it might be accurate?

Dead Parrot · 08-01-2023, 06:03 PM

Mine is the same cold. Once hot, the at idle pressure is lower but goes back to that when I rev it a bit. The motor has about 110k miles on it.

07-12-2023, 03:23 PM	#1
K10-Kansas Senior Member Join Date: Nov 2022 Location: Kansas City Posts: 468	73 electric gauge in 71 dash cluster Edit: It's actually a 78-79 electric oil gauge in a 1971 K10. I think I have the wiring correct now but perhaps the ADO-D8034 sending unit is the wrong sending unit. Hi. I've put an electric gauge in my 67-72 dash cluster. I assume 1 post in negative, one is positive, and the other is for the sending unit. I thought about trying random setups but felt I should get advice first. Attached Images __________________ 1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350 and 700r4. ~ James Last edited by K10-Kansas; 08-01-2023 at 06:21 AM.

07-12-2023, 07:21 PM	#2
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,916	Re: 73 electric gauge in 71 dash cluster Temp gauge I presume. Look up the 1973 wiring diagrams. The cluster layout is on the first page of diagrams. __________________ 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.

07-31-2023, 08:17 PM	#4
K10-Kansas Senior Member Join Date: Nov 2022 Location: Kansas City Posts: 468	Re: 73 electric gauge in 71 dash cluster I found this picture in another thread. Someone trying to work out the same question. Attached Images __________________ 1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350 and 700r4. ~ James

07-31-2023, 08:19 PM	#5
K10-Kansas Senior Member Join Date: Nov 2022 Location: Kansas City Posts: 468	Re: 73 electric gauge in 71 dash cluster Here's my current setup. The brown is ground. Pink is 12v. I don't see colors very well so I'm guessing that's pink. My blue is the sending unit wire. The oil is showing running high. I bet that's not accurate. If I flip the 12v and sending wire it sends the needle all the way to high past 60. Attached Images __________________ 1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350 and 700r4. ~ James Last edited by K10-Kansas; 07-31-2023 at 08:29 PM.

07-31-2023, 08:42 PM	#6
K10-Kansas Senior Member Join Date: Nov 2022 Location: Kansas City Posts: 468	Re: 73 electric gauge in 71 dash cluster I'm using an ACDelco Oil Pressure Sending Unit that I realized today doesn't list 78-79 c10 as a fit. It does list 1977 https://www.summitracing.com/parts/A...4/applications I am using a gauge for 78-79 c10 https://www.lmctruck.com/1973-91-che...pressure-gauge Is it reading high because I bought the wrong sending unit? This one shows a 78-79 c10 as a fit https://www.summitracing.com/parts/s.../c10/year/1978 So maybe the make and model of the vehicle doesn't matter in relation to the engine dictating what sending unit to use but instead, the make and model of the vehicle dictating what sending unit to use per the gauge that was in that make and model? __________________ 1971 C10 manual cab. 76 4x4 chassis. Cut short frame. Carbureted Blueprint 350 and 700r4. ~ James Last edited by K10-Kansas; 07-31-2023 at 09:03 PM.

08-01-2023, 03:30 PM	#7
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,494	Re: 73 electric gauge in 71 dash cluster That oil pressure is a near match for what my 75 with a stock 350 shows when at speed. OEM mechanical gauge. Disclaimers - sample size of 1 and ~48 year old gauge.

08-01-2023, 06:03 PM	#9
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,494	Re: 73 electric gauge in 71 dash cluster Mine is the same cold. Once hot, the at idle pressure is lower but goes back to that when I rev it a bit. The motor has about 110k miles on it.



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