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I had Westach build me one to work with the factory harness. www.westach.com. Talk to Pete Cornelius. Model # I got was 2T3-1 with adjusting pot. The "2" represents 2 inch. They make larger.
Isspro makes one too from what I've read here. Might have a sticky needle though?????
their 2" tach p/n R8503 and their 1992 mounting kit p/n R8912-92.
This kit plugs into the already-available jack on the 1992 trucks under the dash just to the right of the steering column and connects to the tach. Lighting for the tach is taken care of by the kit.
How you mount it is up to you. I bought a standard right-angle mount at the local supply place. Then I put the tach into it backwards, and slid the mount into the place you put your fingers to pull out the ashtray. Some foam rubber inserted into the slot holds it in. That looks ok until I can change the 3-gage holder above the dash to a 4-gage holder and relocate it there.
I used an autometer diesel tach and it worked great. I have an early 1991 so I did not have the chance to use the under dash plug and that was the reason that I chose the autometer. If you search for some of my previous threads there are some pictures of my four gauge installation.
Ok, could someone please enlighten me on this tach wire on 92 and 93 trucks. I have a 92 and would like to put in a tach. Does it have to be a diesel tach or is this wire a pulse from the altrnator or something that can be used with a standard tacch. Please enlighten me. Thanks!
I used the diesel tach part number 2888 from autometer. I bought it from summit racing for 114. 95 and that included a gauge cup, the alternator transducer and the gauge! It was a super easy install. I would recommend it to anyone. It will work for any truck with an alternator regardless of engine or number of cylinders. The only hurdle is that you must calibrate it. At first I used the no-load high idle of 2600 to calibrate it, but I just bought an optical tach off of ebay for $60 to use for calibration. It turns out that I was off by about 50rpm. I think that it really matches the original gauges nicely. Check out my truck pics in the readers rigs section.