Need Gauge help. Thanks

As I understand it, the wire going to the temp sender is a ground completion, so it pegging mean the temp gauge is grounding somewhere. The ammeter gauge will burn out by looking at it funny. I went through three or four of them on my '64 Valiant before I had Redline convert one to a voltmeter. Ammeter isn't even connected to the circuit board, so I doubt anything you did to the other gauges did anything, although it does sound like you have a grounding problem somewhere.