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What would be the impedance of the HUMVEE tach? Could I just measure the resistance between the signal + and - input points on the tach and call it close enough?

Yeah! When I took electronics in high school, we were learning how tubes worked! Transistors were a new thing!

I already have the 700R4. The vehicle is a civy suburban. I'm wanting to keep the vacuum pump for the HVAC controls as they are vacuum operated. Just trying to get a tach to work in the thing. I also have one of those ess sending units for the HJMMVEE. If you ever get yours hooked up and...

After I posted to you the other day, I thought about the B and C points and remembered about the Base, Collector, and Emitter of the transistors and it made sense. If I wanted to hook up an oscilloscope to this circuit and see the waveforms, would I put the negative probe to ground and the...

The diagram I have doesn't show point B or C. Not sure what they refer to. My ess has 2 pins for a connector. In the diagram I have it only shows one lead from the ess going into the circuit. What happened to the other? Do the pins have polarity? I have the Diesel Page book that has the...

Keith_J thank you for the explanation of how that circuit works. Not sure what a comparator is though. I'll keep investigating and see if I can drive a tach with that circuit and my vacuum pump/ess unit. Could I ask you more about that circuit from Lee Wagner?

I have one of those vacuum pump/ess units in my 84 civy suburban with a 6.5 replant. It is a stock calif. vehicle. I've wanted to hook the ess to a tach but having trouble figuring out the wiring. I have seen the info from Lee Wagner. If I were you, I would go with the alternator tach setup...