Originally Posted by setidball
Absolutely!! If you have a sig gen available that would be super easy. I don't have a sig gen but I did have all the components to make one. Frequency only maters in that it must be greater than the equivalent of 400ish rpm. A faster rpm does not advance the hr meter faster but the tach/meter must believe the engine is running ... so, idle or above. S
What "make"? TrueRTA and RoomEQ Wizard are free programs that have signal generators and in the case of TrueRTA, you can choose sine, square, triangle and sawtooth wave forms. You just need to interface the output with the tach.