I don't see why it would not work for a light bar.
As for the wiring, if all you want is a switch and don't care about lighting it up, then just use a multimeter on resistance setting (ohmmeter) and find the connectors that the switch interrupts.
The pins are in different positions than the switch I just got from Team Fas, but the number of terminals is the same so their diagram will give you some idea what the other terminals are for.
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