mach1 wiring Nightmare

Welcome Ron I'm kinda new myself.I don't have a wiring diagram but they are a few things you could look at to start with. On the back of the instrument cluster there is a little device called a constant voltage regulater. It's a couple inches long and about 3/4 in wide. Check to see if you are getting voltage in and out of it. If you test it with a test light the voltage out should cause your light to blink. It provides posotive voltage to the gauges (except to the amp gauge and most of them didn't work good from the factory). Also check the ground to the cluster. Hope this helps.