Bernardd Posted May 9, 2009 Share Posted May 9, 2009 I've upgraded my setup to a wasted spark coilpack ignition system. I can get a 400rpm signal on my tach at 1200rpm when I connect to one coilpack. What this tells me, and please correct me if I'm wrong, is that I should get the correct signal if I connect to each - coilpack. I need to isolate the signal to keep from firing each coil with a diode. I need to know what spec the diode should be and if any has any different ideas on getting this to work. The car is a 83 turbo. I found something that looks like it will work:http://www.gadgetjq.com/tach_install.htm Quote Link to comment Share on other sites More sharing options...
eec564 Posted May 10, 2009 Share Posted May 10, 2009 That should work. However, megasquirt users switching to EDIS use the schematic found at the bottom of this page. http://www.megamanual.com/ms2/EDIS.htm It uses a zener diode to protect the standard diodes rather than resistors and should help isolate noise. Quote Link to comment Share on other sites More sharing options...
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