Swapping gauge insert - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**hatzie** · 12-07-2021, 07:46 PM

It's not oogie boogie. It's also not difficult.
You can swap 1973-80 warning lamp clusters for 1978-80 gauge clusters with some minimal work. Don't use the 73-77 clusters for this.
1973-75 gauge clusters have ammeters and capillary tube oil pressure gauges.
The ammeter was replaced with a Volt gauge in 1976.
The capillary tube gauge was superceded by an electric gauge in mid 1977.

The gauge fonts and colors changed in 1981.

The wiring from the engine bay will work for gauge senders or lamp switches.
The instrument panel plug will need to be re-pinned.
The temp and oil pressure switches will need to be replaced with gauge senders.

Pinout charts are in this thread. http://67-72chevytrucks.com/vboard/s...d.php?t=456877
Year specific GM wiring diagrams are in the manuals thread in my signature.

12-07-2021, 07:46 PM	#9
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 5,049	Re: Swapping gauge insert It's not oogie boogie. It's also not difficult. You can swap 1973-80 warning lamp clusters for 1978-80 gauge clusters with some minimal work. Don't use the 73-77 clusters for this. 1973-75 gauge clusters have ammeters and capillary tube oil pressure gauges. The ammeter was replaced with a Volt gauge in 1976. The capillary tube gauge was superceded by an electric gauge in mid 1977. The gauge fonts and colors changed in 1981. The wiring from the engine bay will work for gauge senders or lamp switches. The instrument panel plug will need to be re-pinned. The temp and oil pressure switches will need to be replaced with gauge senders. Pinout charts are in this thread. http://67-72chevytrucks.com/vboard/s...d.php?t=456877 Year specific GM wiring diagrams are in the manuals thread in my signature. __________________ 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; 12-07-2021 at 07:56 PM.

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