1986 CRX DX in ITC. Tachometer fails to work intermittently. Checked all wiring & ground. Car has aftermarket ignition box, stock distributor. Tach fails at the same time that the clock and fuel gauge fail. In the middle of the race, the tach et al, may run for a lap or two and then quit. Driving me nuts! Almost looks like there is something loading up or heating up to a point where there's too much resistance and then it quits. The real puzzle is the apparent connection to the clock and fuel gauge? I'm getting desperate.