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Happy Easter Slowpoke. Geeze, you have me on that one. After a fuse on the non-working speedometer, I have no clue. As for an intermittant tach, I'm thinking a loose wire. For my Cummins Dodges, I have a Haynes brand manual, and has the wiring diagrams for them. You didn't list Haynes as one of the manuals that you've tried. Might try there. Do have mine. Years ago I picked up a 4x4 magazine out of boredom and was reading it. Had an article on huge mudder type of tires and how affected the ABS, so I started reading. Was an eye opener. They used an '88 Chevy pickup as their...test vehicle. I learned two things from that. That the gas peddle wasn't actually connected to anything other than electronics, and was spring loaded to make the operator "feel good" in that prior to that, all gas peddles were actually cable and spring loaded to a carb or whatever. So gives the operator the sensation of having a spring loaded cable going to the injectors, but really doesn't go anywhere other than to electronics (computer). WOW!!! Then I learned that when these guys put those big Monster Mudders and stuff on their trucks, have to recalibrate their computers because throws the ABS way off. Apparently the ABS calculates the distance that it will take to stop at a given speed, and does so. So these guys get these huge tires and are actually moving faster than the transmission (speedometer) calculates because of the tire diameter. So, the speedomter (trans) says is only going 30, but because of the tire diameter might be actually be moving 40 or... They hit the brake peddle, the computer says "doing 30, will take x amount of feet to stop", and they drive right over the back of someone's vehicle because the computer had no way of knowing was actually moving 40 or... WOW!!! Electronics. I guess that they all work that way now. Mark
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