Dash power running through Alternator gauge?

Michael Brisebois said

What you'll need to do is connect the red and black together, bolt them and electrical tape the whole mess.

The AMP gauge will be by-passed. I've heard that the AMP gauges can catch fire, if too much current goes through.....but I've never seen it. I'm still running the OEM

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This....and then trace the two thick wires back to the bulkhead connector, unplug and clean the contacts there. I like to trim those disposable finger nail files to scuff the male side and a stainless steel toothbrush looking brush to clean the female side. Make sure the female side fits tightly on the male spade. I also cover the connections in dielectric grease. I have used scouring powder mixed with a bit of water to help clean the female spades with the small wire brush, and then rinse well. Check all of your wiring for damage and address any you find.

You can also run a heavy cable from the output lug of your alternator to the positive post on your battery or starter relay lug(as long as you have a similar gauge cable from the starter relay stud to the positive battery terminal.)

Make sure you fuse or add a fusible link to that cable with the appropriate size fusing. Car audio fuses can come in handy here if you can't find large enough rated fusible link wire.