10. Because the Offrotec locker operates silently, the kit includes a shift-fork position sensor and light to tell you when the locker is engaged. While testing at Pismo Beach this dash-mounted signal became known as the "red light of traction." During our two days of testing we engaged the locker under every condition we could think of--except at full throttle--with one tire spinning, that could probably break any locker or axleshaft. The locker always did as it was told and engaged every time in less than five seconds.