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  1. 94-98 Non-Powertrain
    I recently bought a 1997 Ram 2500 12 valve with a 5-speed manual transmission. It runs great once it's going the alternator won't charge and the Tachometer, speedometer, and odometer are all not working. I replaced the alternator and still no luck charging. I'd appreciate some help if anyone has...
  2. 3rd Gen. Non-Powertrain
    Hello, My tachometer has had a reoccurring issue where it doesn’t move when the truck starts, however, under heavy loads it will slowly rotate as if it is measuring boost. Sometimes it will flip all the way around and still ‘measure the boost’ just in reverse. When it was cold in December and...
  3. 89-93 Non-Powertrain
    So as some of you may know I am halfway through the process of de-computerizing my truck. PCM doesn't like to work when its cold out and since winter is just around the corner it will be soon that I won't have any cruise/A/C function at all until Spring... no biggie. What I would like to have...
  4. Cummins Conversions, Shop Talk, Tools, Fabrication
    How would I wire a factory tach from a ‘93 6BT up to my 90 F350 tach? Do I need to spend the money on a swap helper?
  5. 89-93 Non-Powertrain
    Hey all! Just joined the forum since I recently purchased a 92 D350 and today I tried installing a R5501 tach and was not getting any signal to it. I used the isspro wiring harness to wire it directly to the factory plug underneath the dash and the gauge would light up and I was getting power...
  6. 94-98 Non-Powertrain
    Hello Iam new to the fourm..... Back story for the damage that caused these issues most likely. On 12-21-20 I was stopped in trafic on the freeway, a three quater ton 300ft+ behind me was not slowing down I did not have anywere to go but take the hit.... So he hit me on the driver side his...
  7. 94-98 Non-Powertrain
    i have a 2008 ford f350 with a 12 valve cummins. when i start the engine the tachometer either doesn't move at all or is jumping all over the place, but if i start the engine and simultaneously press on the gas pedal then the tachometer works fine. How do i fix this? I already replaced the whole...
  8. 89-93 Non-Powertrain
    Working on my 91.5 w250. Can anyone post some pictures of the connections to their factory/dealer installed tachometer on 91.5 and back trucks? Thanks
  9. tach-amp

    This is the tachometer drive circuit and amplifier I built to replace the PCM drive circuit. This circuit provides output similar to the backlash in an ignition coil that gives a strong zero crossing signal the tach uses as timing pulses. Have fun!
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