bought a ford racing tach adapter for my '03 f150 4.2 6cyl 5 speed. i hooked it to my tach and the 2 wires they claim its supposed to hook to but all i get from my tach is nothing. if anyone knows how to hook a tach up with a tach adapter, some help would be well appreciated. the crankshaft position sensor is where im supposed to hook the adapter to. not sure if i even have one.