could this be causing an issue?

ah, You said the oil pressure gauge worked fine where the wire would stay on the sender.When that wire terminal falls off the sender and shorts to ground, the mechanical limiter will send full system voltage to all the gauges. That condition has also fried many gauges.
As for moving the gauges internals from one to another... Thats not doable.
You might move the screen from one to the other. The readings wouldn't be right though, unless the gauge is recalibrated to the fuel gauge screen.