Quote:
Originally Posted by rusty904
All very helpful info, thanks very much. My truck came with an aftermarket Tach installed, I'm wondering if I will be able to use that same wiring with a factory Tach?
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I am guessing it would work but here are a couple things to try first. One is just google the model of tach and see if there is a wiring diagram available for it. The factory techs are based on the number of times the engine fires per revolution is my understanding, so 4 for the 4 cylinder and 3 for the V6 (or maybe 6 on the 3.0 ? I am more familiar with the wasted spark system on the 3.4). This is why the tachs read different between the engines and it can't be corrected. If the aftermarket tach is driven off of the coil as I expect, then it would probably work.
I would probably take the tach out and just make a jumper wire for the tach test port and provide a ground and see if it runs. If it works fine then it should be operating from the same signal as the factory tach and your existing wiring should work fine for the SR5 cluster.