The standard in the automotive aftermarket for tach signals is a 12V square wave, with a configurable # or pulses per revolution, typically 2,3, or 4. That said, I would expect that many EMS systems would be able to manage pulses with a lower voltage, but that would be based upon their design. I can't imagine any EMS that couldn't tolerate a 12V signal, given that most systems provide that, so pulling the Diode out may be worth trying. Have no idea what a VM100 is.
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Last edited by lr172 : 07-22-2022 at 07:00 AM.