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73-87 Chevy _ GMC Trucks => Interior & Equipment => Topic started by: Boostaddict on August 02, 2011, 12:11:45 pm

Title: Which printed circuit do I need? '80 or '81?
Post by: Boostaddict on August 02, 2011, 12:11:45 pm

I have a 1980 all original GMC truck that has the 85mph base cluster (picture below).  I want to install a '78 tach cluster but the printed circuit is in horrible shape.  The aftermarket printed circuits I see are either for '78 to 80 trucks or '81 to '87 trucks.   I'm assuming I need the '78 to '80 circuit but wanted to double check since I see clusters that look identical to mine in newer trucks also.

Thanks!
Wayne

(http://northbendtech.com/wayne_k/misc/truck/insurance/truck-9.jpg)

Title: Re: Which printed circuit do I need? '80 or '81?
Post by: topp on August 02, 2011, 12:14:55 pm

The tach is not driven off the printed circuit.  It has it's own wire harness.
Use the one for your year truck.

Title: Re: Which printed circuit do I need? '80 or '81?
Post by: Boostaddict on August 02, 2011, 02:35:44 pm

Thanks for the quick reply.  Thats what I thought but since I've seen this style cluster used on the newer trucks too ('81, '82, etc) I wasn't 100% certain that a '80 circuit will work.  I'll give that a try and see how it works.

Title: Re: Which printed circuit do I need? '80 or '81?
Post by: Captkaos on August 03, 2011, 09:01:45 pm

1978-up clusters will swap, so the only real difference is the font and the speedo only goes to 85 on the 80-ups.