None of my factory gauges work 65 dart gt

Strange that your bulkhead connector is in sideways. There is a little plastic triangle at the top to key it. 1965 was the best year for bulkheads, as yours has the dedicated big feed-thrus for the large ALT and BAT wires, so ignore other's problems with melted plastic. Notice that you have some spare terminal positions if you need to run another wire thru like for AC clutch or washer pump. The terminals are "Packard 56", shared w/ GM cars.

Be careful working on the ammeter, as those wires are always hot. I just threw a spark a few days ago when tightening a bolt at the temp switch and my wrench touched a terminal. P.O. might have done the "MAD Bypass" for the ALT charging, which would make your dash ammeter show little, though not needed for a 1965 (or 1963). Insure the circular plug on the back of the dash cluster didn't come out, but you said the turn signal lights work so at least those are connected, but the individual terminals on that plug can backout and the pins on the board can crack the solder. Otherwise, read up on the voltage-limiter. You can replace the electro-thermal one built into your fuel gage with a $10 external one as most people do. A post on just that currently.