Hey, posting this for my dad, he has a Faria TC9864D tach, with a Mercury tach harness 1H15105, for a 97 50 Mercury Force, his problem is signal wire is gray,ground is black and purple is ignition, on the back of the tach he has a signal,ground and a BAT terminal, is BAT the same as ignition?<br /><br />Any help appreciated
