[Blas]

Most MSD problems are related to wiring in one way or another. Improper grounding and incorrect power supply sources are the usual culprits. Coils mounted in the incorrect orientation or too close to hot exhaust headers or in high vibration areas are common issues. A power surge will kill them too. If you don't believe that, just switch off your master kill switch with the car running a few times. MSD is the system we show on the MKIII Wiring Diagrams we sell. A quick way to test the system is to disconnect the main MSD power supply from the car and temporarily power it from a remote battery. See if the bouncing amp meter goes away. Check that your wires going to the distributor from the MSD are not too close to a spark plug wire or taped together with any other wiring. Yes, the SCOF site has a fix for a jumpy amp gauge. But I would think you would be interested to know why it started jumping after the addition of the MSD box. It didn't before, and most cars have no problem. Why yours then?