I just started my car for the first time yesterday. I have 347 with sniper efi and hyperspark ignition system. the car runs well.
I can't get a couple gauges to work though. Any help would be very appreciated. I probed all the wires with the ignition on.
They all show power and ground and all the lights work too. I double checked everything and its all wired per the manual. It's almost like all the signal wires are the culprits, but i cant believe there would be so many gauges not working....

1. The tach does not show any movement at all. It's stuck on 0 rpm. The sniper efi shows the rpms correctly though. I have the dark brown wire from the efi to the signal wire directly on this one.

2. the fuel gauge works well
3. the voltmeter works well.
4. The oil pressure is pinged at 100 psi. and doesnt drop until the ignition goes off back to 0 psi
5. The water temp pings at 250 degrees. I know this is wrong obviously as the efi has the car running about 190 constantly with the fans working.

thanks,
tony