it is either on your distributor or next to your cam gear... behind the harmonic balancer. its easy to chang just have to take a couple things apart.. now mine was mounted wrong and wires were exposed so i just cut spliced then re routed the wires. also clean the balancer plate it measures on.. collects alot of black gunk on it... break cleaner works best. and clean magnant if equipped. it might just have a little hole it sits in which you dint have to do anything. it just measures timing of cam gear.
