64 Dart cluster connector

Wvbuzzmaster said
It is keyed to fit only one way. If your temp and fuel gauges worked before and not now then the path to ground thru the different sending units Could be the issue. I would verify 12 volt power to the regulator on the back of the cluster. Beyond that regulator it is not a constant 5v reading due to regulator style but also a voltage source below 5 volts can be used to test those gauges to verify they move. After that it’s a deeper issue, but could be sending unit related.

I don't see a regulator just the "condenser " and the round multipin connector.

Wvbuzzmaster said
It is keyed to fit only one way. If your temp and fuel gauges worked before and not now then the path to ground thru the different sending units Could be the issue. I would verify 12 volt power to the regulator on the back of the cluster. Beyond that regulator it is not a constant 5v reading due to regulator style but also a voltage source below 5 volts can be used to test those gauges to verify they move. After that it’s a deeper issue, but could be sending unit related.

They worked fine before I pulled the dash to change the bulbs. And by pulled I mean unscrewed ,disconnected the ignition switch and tilted the dash down to access the bulb sockets.