Autosport Labs

I have re done the circuit again. Popped on a 1N4007 on each coil, with a 100K ohm resistor in parallel with each. Again this worked fine for around 20 minutes (accumulated over a couple of runs), then the tacho just stopped working. I'll pulling my hair out (what little I have left!) trying to get ...

The original dash instruments on the 1992 Ford Sierra were running off the single coil on the 1.8ltr CVH engine. To get the tacho to work with the new 2ltr 16 valve engine and MJ I used the diodes (1N4004) on the coils, with a zener (1.3w 15v). However it was super erratic, so I ditched the zener an...