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Clever people!

You should research it. It existed and it came out in 1948. It was electronic with a transmitter and a receiver in each car and two in the locomotive.

I have lots of old Lionels myself. it is amazing how cleaver they were. In the thirties you could set up an elaborate layout with switch tracks interconnected so that the route would always be changing. Yours being '53 is it the "electronic" set?

Yes, temp, fuel and pressure are a balanced coil set up. One coil is a reference as such and the second coil is hooked to a resistive element to register change. This is done so the readings do not change with voltage supply change. They all require two isolated terminals and a ground connection...

Good job! 1) Yes they "flop" 2) The ground scheme is flaky at best, it relies on too many points of contact, metal to metal, with rust, paint and who knows what else gumming up the works. Any of the M vehicles that I have had that act up gauge wise immediately get another "star" harness on the...

The temp gauge terminal that runs to the engine sensor, is the closest wire to the throttle cable you were fooling with. If the wiring is old, it is probably right at the gauge where you could have mashed the wire. If the insulation is brittle it will flake right off and short to the metal shell...