95 Civic EX, OEM guage cluster with tach. used to work fine. i had my engine replaced, now the tach doesn't work. the guy who switched it (hack job apparently) says he doesn't know what's up. i probed the blue tach wire with a multimeter, and the wire resistance fluctuates up and down when i rev the motor, but nothing on the tach. any ideas? i tried engine tech but those guys are cacs :fawk: