I can answer your questions regarding the usage of the meter only.
You correctly selected the 20 VDC scale and connected the negative lead to a good ground.
The drive voltage for the IMRC should be either battery voltage or 0 volts. One or the other. One will cause the IMRC to activate around 3000-4000 RPM (whatever the threshold point is on the Contour), the other will cause it to de-activate. I don't know which, and at this point, it really doesn't matter as all you need to do is observe the control voltage change at the proper time.
Perhaps someone else will chime in with the correct voltage values.
Steve
