azreark1
New Member
so i bought a sunpro 52mm tach for my truck and got it wired up, hooked it up to the alternator and the thing works except at idle its showing my truck running at 3500rpms...now i KNOW this is wrong lol so i've read that the reason for this is the pulley size being wrong but i cant find anything about what the correct pulley size is...anybody have some light they can shed on this subject?