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taaron

Megasquirt 2 Factory Tach

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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. 

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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.

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