Re: back up lights
If you have console shifter, the neutral safety switch and back-up switch are part of the shifter in the console, nothing connects to the trans. Remove the letter plate, then remove the plate covering the shifter and you will see the switch on the right hand side of the shifter - purple wires for neutral start, they go to the starter solenoid, purple/white from the ignition sw, purple to the solenoid; back-up switch has green/white for power from ignition switch and fuse panel, green to rear lights via body harness on drvr kick panel and running down gutter underneath carpet by the door, remove sill plate.
Cars this age have ground problems due to rust forming at connection to body. Clean with wire brush, both body and terminal, use a star washer, and cover with dielectric grease to protect connection.
IMO, if you can get the harness/circuits to work using the OE harness, don't fix it, patience is the key.
If you still have R-12 system, you should rely on a HVAC tech to evacuate, change receiver dryer, lube the sytem as in add oil, do a triple vac, and check for leaks, then charge, $80/lb for R12. If you have to change compressor, then changeover to R134A would be the next step. Look into Hot Shot, R12 direct replacement. JMT's, your's is dependent upon staying OE design or not.
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