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Helpful thread as usual. A few questions for a '79 ...
-Does the gauge cluster require a 5 amp or 7.5 amp. I have seen it both ways.
-My fuse keeps blowing. Sometimes I think its due to the tinkering I am doing with the gauge cluster but I literally just installed a 5 amp fuse. I turned the headlights on, turned the dimmer switch. It worked and then blew instantly.
-I recently replaced the gauge PCB and its working pretty good. The speedo/tacho PCB looks pretty good so I didn't look closely at it.