After installing the 2004 "upgraded" wiring harness into my 2000 small bock which was a *#%king nightmare and even more difficult to route the wires, my tach doesn't work. I should have stayed with the stock harness because I see no advantage with the 2004 version but only problems. When I turn on the ignition the needle moves to zero so I know it has juice. Starting the motor, however, produces no needle movement. What have I done wrong? Please explain in electronically challenged gynecologist terms....Joe