Engine Mgmt., Fuel, Spark, EGTs, & Air/Fuel Ratios
ok, so im new to this and i need help. my tachometer works great during the daylight, but when i turn on my lights it goes completely dead, and when i turn on the rear defroster it shows a 500 rpm increase, even tho the engine stays the same. i know its a wiring prob and that the tach is...