Year 2000 and up toyota tacoma pickup has a clutch safety switch. It activates when the pedal is pressed FIRMLY to the floor. If there was any floor matt or such in the way, the stupid thing wouldn't start, and the same with activating the locking rear axle differential...wouldn't activate without the pedal down solid. So I bypassed the switch. Engine won't start w/o some oil pressure anyhow, so needs to be cranked for several seconds to fire. Works great...truck just jerks forward a little if pedal is not down, and engine does not start.
IMO if you do any backwoods/mountain roads eventually the engine stalls/get stuck in the middle of a deep creek or river. Really helps to be able to crank the starter with manual trany in gear and walk the vehicle out onto dry land.