Speedo Issues
 

Wondering if anyone has some input..... I have a 69 Camaro with Dakota Digital VHX gauges. PSI harness and a T56 magnum, using a ECU out of a 2002 Truck that has been flashed and tuned. I have the one wire lead from the ECU hooked up to the Dakota Digital box as instructed for the speed input. After trying several times to calibrate the speedo using a "measured" mile, I still can't get it correct, even tried using my GPS to manually calibrate the speedo. Evidently, the trans speed sensor is not sending enough pulses to get a correct reading. Talked to the guys at AMP performance where I purchased the trans and was told that the T56 Magnum has a "Ford" style 12 tooth reluctor, not a 18 tooth GM style?? I know a lot of guys use the T56 and Dakota Digital stuff...... Any thoughts??

Thanks, Dave

I tried using the E67 pcm output on my DD guages but the speed was wrong. I know all of the correct parimeters were input the first time. I ended up using the procedure in the installation maunual for the gauges to "adjust or compensate" for the difference that is listed in the instructions. I used my garmin GPS as the correct speed # and drove and hit the buttons until it read correctly. Was kind of a pain to do while driving but after everything was said and done it works correctly.

That does seems odd. What about all the Ford guys that have Ford T-56's? I'd also try calling Dakota Digital. I've picked their brains a few times and they were always super helpful.

Are you sure that you're getting pulses sent? Does it read out pulses during the calibration part?

The last set I installed I wasn't getting pulses. Some idiot(me) wired up the sending unit on the transmission wrong so the computer wasn't getting any pulses.

It seems as though it's getting pulses, but not the minimum 2000 needed to calibrate ?? Dakota digital tech line was not much help......