I know this is isn't O scale, but it relates as MTH used the same boards in DCS.
I have one of the original G scale hudsons, which has the 5V system. Along with a newer one that is missing the engine board (3V) Can I take the 5V board and put it into the 3V wiring system? And replace the battery with a battery eliminator. Would I have to rewire the entire engine to 5V?
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i would not waist my time as 5 volts boards are way past there life expectancy and the 5 volt boards may fail at anytime, why not try to get ps2 3 volt board from somebody!
what is your engine item number would help if we knew exactly which engine you have!
Alan
You would have to change the connector shells on the 5V board to match the 3V harness connectors. We routinely did this back when we were replacing 5V board with 3V boards.
However, I have to agree with Alan, save the working 5V board for the next 5V board that croaks and just get a 3V board, or a PS32 board for the Hudson. I keep several old 5V boards in the drawer for when one bites the dust.
If you used the 5V board, you'd have to add the charging harness and swap the speaker out.
you could purchase the ps 3/2 made for replacing 5 volt boards and everything should work if you get the correct flash code for your engine ! the ps3/2 board can only b purchased from ASC tech's and they can repair it for you!
Alan
Since he wants to put it into a locomotive with 3V connectors, it's even easier. No speaker to replace, just bolt it down and plug it in. 
Are you sure the board from a one gauge Hudson is 5 volts?
Don't go by the catalog date. They were delivered much later I believe.
I am with Joe on this. The 3V was originally designed for the 1 gauge. G
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