Just plug the propane line with the correct size flare plug. Leave the 120 volt AC plug alone. Depending on how many amps the new 12 VDC compressor draws, you will probably need to run a new 12 volt wire of the correct size from the 12 volt panel or directly from the battery(ies). This wire will need to have the correct size fuse installed it it. There will also be a ground wire involved.
If your husband is not familiar with 12 volt wiring, I would suggest he hire a technician.
Ken
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Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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