[94-turbo]

Hi, I'm finally brave enough to try to begin connecting my MPGUNIO to my 1994 GMC Turbo diesel.
This engine has a computer that runs a controller (PMD.... Pump Mounted Driver) That operates a poppet valve solenoid to control the injection pump. It pulses once each time a cylinder needs fuel, it controls the length of the pulse. So with this being said, the mpgunio will see every pulse made for the engines injection not just for one cylinder, but all 8, or roughly 150hz at 2500 rpm.
Can the inj input handle that?

I used a hand held oscilloscope, I looked at the electronic controller module (PMD) and I have a square wave 2.8v that goes from 37% duty cycle at idle (800 rpm) to 50+ duty cycle at 2500 rpm (no load), I realize the mpgunio requires a 12v dropping to ground or "0v" for a duration to sense the injection time.


Do I need to use an inverter circuit to change this pulse to a ground or "0" v for the pulse duration? I see it has a 0or1 for inj pulse up or down, will this enable me to run it if it senses a pulsed 12v+ longer duty cycle upon more fuel usage rather than a 0 volt as used on your gas engines injector system?
Any info may be useful!



Also, what kind of numbers should I see when I start the engine, and numbers when I get the vehicle rolling to be sure things are working?