Rick,
It would depend on the voltmeter. I have one that will read up to 10 Amps and I doubt if he has that much draw.
I don't know about the MSD but on my Jacobs Pro Street module, I can disconnect two wires and move them to another place on the terminal strip and run the car just through the distributor and coil like they bused to, which makes it easy to eliminate the Jacobs as a cause of problems.
Ron
