Factory Tach
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Factory Tach
I'm rebuilding my '85 F150 from the ground up and bought an '85 Lariat for parts. One of the things I've added out of the Lariat, was the factory tach. Does anyone know if the tach is able to be calibrated, it reads 500 RPM higher than actual. confused:
Thanks
RCC:
Thanks
RCC:
Thread Starter
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Senior User
Joined: Jan 2001
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Factory Tach
No it reads 0 with the key off. I've since solved the problem. The truck came with a I6 which I replaced with a V8 and the wiring has to be modified for the tach to read true with the V8. The #12 wire on the instrament panel harness (black wire) has to be cut and grounded forthe V8.
RCC
RCC
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Joined: Jun 2003
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From: Edmonton Alberta Canada
Factory Tach
actualy, you must have the 6 cyl engine harness, because I have found that the 8 cyl harness have the groud wire that allows the factory tach to operate in the 8 cyl mode, there the tach wire plugs in, in the engine compartment, there are 2 wires, green/yellow and black, the black is the ground wire for #12 on the cluster, if you ground that, you will gound the #12 pin of the cluster allowing the tach to operate in 8 cyl mode
