Noddle Posted December 30, 2008 Share Posted December 30, 2008 Hi, I've got EDIS running now, but when I connect pin 2 from the EDIS unit to my tach, nothing happens, so with some more research I came across this diagram (left), its talks about "- side of the coil", is this referring to pin 10,11 and 12 on the EDIS unit ? if the answer is 'yes' does it matter if it's taken at the coils (pin 1,2 & 3), or at the EDIS unit (pin 10,11 & 12) Nigel Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted December 30, 2008 Share Posted December 30, 2008 so with some more research I came across this diagram (left), its talks about "- side of the coil", is this referring to pin 10,11 and 12 on the EDIS unit ? Yes, it is. if the answer is 'yes' does it matter if it's taken at the coils (pin 1,2 & 3), or at the EDIS unit (pin 10,11 & 12) Nigel No. Either end of the wire works just as well. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted December 30, 2008 Share Posted December 30, 2008 I have my 280Z tach running directly off of PIN 2 on the EDIS module. It is somewhat intermittent and works best when the car is warmed up, or in warmer weather. I already bought the diodes to rig up the circuit to try out the (-) coil wiring scheme though. Quote Link to comment Share on other sites More sharing options...
z-ya Posted December 31, 2008 Share Posted December 31, 2008 What year is your tach from? If it is a 70-72 tach it is a current sensing tach. If it is from a 70-72, you can just power the EDIS coil pack from the black/white wire that powered the original 240Z coil. The tach will count current pulses, it doesn't care if multiple coils are creating those pulses. Quote Link to comment Share on other sites More sharing options...
Noddle Posted January 1, 2009 Author Share Posted January 1, 2009 What year is your tach from? If it is a 70-72 tach it is a current sensing tach. If it is from a 70-72, you can just power the EDIS coil pack from the black/white wire that powered the original 240Z coil. The tach will count current pulses, it doesn't care if multiple coils are creating those pulses. I have a 240K (skyline '77), I don't know what type of tach it has, all I know it was originally connected to the negative side of the coil, wiring diagram shown in this pic. Nigel Quote Link to comment Share on other sites More sharing options...
z-ya Posted January 1, 2009 Share Posted January 1, 2009 That tach looks just like a 280Z tach. It is a voltage not current sensing tach. You can do one of three things: - Use the EDIS module output (if it works) - Use the diode circuit you posted above - Use one of the spare outputs as a tacho ouput in the MS and add a driver circuit to the proto area of the V3 PCB. Quote Link to comment Share on other sites More sharing options...
Zed2k Posted January 1, 2009 Share Posted January 1, 2009 I use the IDM pin on edis with my aftermarket tacho works great, but I would like to wire up the standard tach at some stage, I changed from the standard unit to get a shift light as well. Quote Link to comment Share on other sites More sharing options...
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