i have a 93 h/b with a 2000 b18c1 and running a p72 spec ecu. the cx cluser of course does not have a tach so i bought an ex cluster from a 92-95 civic on ebay. everything plugged in the same, everything works, mph, gas, and temp and all the lights but the tach does not move. do i need to run a wire or is the tach actually broken