Technical Gauge identification

Okay fellas,
I picked up a parts lot with a few misc. gauges that I can't id. The oil pressure gauge is an NOS Ford unit and carries part #9273 but I don't know the application.

The other two are a mystery.
Thanks

 

#9273 appears to be 35-36 IMHO
Any leading digits on the box anywhere?

 

There is a very faint prefix which appears to be a 48 on the Ford piece.

The fuel gauge box has no manufacturer markings but is stamped 11104 and has a hand written number of 200471. Neither of which yield anything on an internet search.

The voltmeter box has no manufacturer markings but is stamped 11588 and has a hand written number of 204459. Again, no help from Google.