LS TACH PULL UP RESISTOR

LS engines put out a weak four cylinder tachometer signal and this part installs to boost the signal to the tachometer to one it can recognize. Most stock ECM GM computers will require this part to function correctly with a standard tachometer. A pull up resistor is essentially a “Booster” for the signal, allowing the potentially weakened signal to drive the tach. This is simply a resistor that bridges across the already existing signal wire and a 12v+ power wire. When doing this you will leave the tachometer still connected as it normally would be. Connect one leg of the resistor to the signal wire on the tachometer, and the other leg of the resistor to the power wire of the tachometer.