I have a 1984 chevy P\U 350. I am trying to measure RPM with my mulitmeter. The instructions with the multimeter say to connect it to a ground and to the negative side of the ignition coil. I thought I had this figured out with the help of my Haynes manual, but the RPM readout is too low and is not changing as the idle changes.
Where Can I connect the tach to get an RPM reading?