taaron Posted July 22, 2019 Share Posted July 22, 2019 Hey, I was wondering if anyone knows if its possible to use the factory tachometer (78 280z), with a megasquirt 2. I tried taking the line that typicall goes from the resistor, and replaced it with the line that I send to the megasquirt, but to no avail. Quote Link to comment Share on other sites More sharing options...
HuD 91gt Posted July 22, 2019 Share Posted July 22, 2019 I purchased a “Tach Match”. Worked great. The MS doesn’t output enough voltage to drive the tach. Quote Link to comment Share on other sites More sharing options...
HuD 91gt Posted July 22, 2019 Share Posted July 22, 2019 I purchased a “Tach Match”. Worked great. The MS doesn’t output enough voltage to drive the tach. mine is a 240z, not sure if they are different. Quote Link to comment Share on other sites More sharing options...
ZHoob2004 Posted July 22, 2019 Share Posted July 22, 2019 The factory tach needs to see a high voltage pulse to register, the MS is either 5v or 12v (can't recall) and won't be enough. I believe you can make a simple circuit using a transistor and a coil (not the ignition kind but the same principle) that will adapt that signal to work with your tach. I've also heard of using the coil winding in a relay for this purpose, but you would have to remove the mechanical switch inside the relay to not be driven insane. Quote Link to comment Share on other sites More sharing options...
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