I recently bought a 1991 civic hatch off my bro who got it off some random guy.he did a rover motor swap and has an Si tranny in it.motor is a D16A8...after driving the car for a few mins the check engine light comes on and throws a VSS code.as far as im aware there is no sensor on the tranny like the 92's and up?the gauges and everything else work fine and we've swapped clusters and still throws the check engine.anyone have any input on the situation PLEASE help