Originally Posted by
JesseT
If I remember correctly, most Ford clocks dont allow enough detuning to make it read right. All have the adjustment screw though.
Another trick that always works is to set an output pin from the MS as tach out. Then connect it to drive a small inductor (e.g. coil from a relay). Then couple this signal to the tacho.
perhaps, but mine reads right from idle to at least 4k compared with megatune, so i suspect it'll be correct further up the revs, but i didn't want to keep holding high revs.