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If you disconnect the plug from the oil pressure sensor then the light should never come on whether the engine is running or not unless you have an earthing fault somewhere in the wiring. The sensor effectively acts as a switch and earths the connection if the engine is not running or the pressure is too low to activate the switch, i.e. the warning light is intended to indicate low oil pressure. It sounds to me like you have a wiring fault, probably around the headstock area as Scotty suggested. This is a common fault with Monsters.
The senors themselves are also a PITA if you happen to wash your bike as they aren't very well sealed and fail if they get water in them. The symptom for this is that the oil light glows all the time, even when the engine is running. The first time it happened to me I thought the engine was about to go bang. Again this is a common fault.
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