upgraded duster alt, no gas gauge, coolant temp gauge, wipers, or dome light

Troubleshooting the NSS is easy. Just go to your starter relay, ID the yellow wire from the key (start) and unhook the OTHER push on terminal that goes down to the transmission. Hook a clip lead from the exposed terminal on the relay, and it should crank.

If not check that you have power on the yellow with the key twisted to "start."

If you do, bad relay

If not, check back through the bulkhead connector, and or get into the ignition switch connector.