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  1. Jeep CJ7 tachometer

    Cummins Tech Section
    Need some help. I’ve got a 1987 4BT in my 84 CJ7 which came factory with a tach, that I’d like to keep. Will I need a new tach? If not how do I wire this one up? My mechanic mentioned something about Autometer selling something to attach to the alternator but he wasn’t very sure. Any help is...
  2. XJ Tachometer Input

    General Discussion
    So, I'm just about finished pouting about my XJ, and mostly convinced NOT to do another OM617a. I am also convinced that decent, somewhat inexpensive, used B3.3Ts do not exist in my section of reality. That leaves me with the 4BT as the next best option to replace my OM617. Having gone through...
  3. Isuzu 4B2T Swap

    General Discussion
    Hey guys! I'm new to this site. I have just completed my project of swapping an Isuzu engine in a 97 Chevy pick up. I need some advice on how to get the original Chevy tachometer to work with the Isuzu engine. Diesel Tim told me someone on this site has done this successfully. Any help you can...
  4. Ever see a mechanical tachometer give a false high reading?

    Detroit, Perkins, Caterpillar
    Well my user name says it all, I don't know jack about diesels, but I'm beginning to learn more then I ever wanted to know. I recently purchased a piece of equipment that uses a 4-53 (late 70's). My question is: Is it even possible for a faulty mechanical tachometer to give a false high...