OK so I bought a 85 Monte previous owner dropped a 350 carb set up in and the only gauge that works is the volts I tested fuel and temp gauge both work temp sender wire is hooked up and fuel sender is getting power and oil sender is hooked up old owner cut harness almost completely the only relay that's there is starter and instrument lamp fuse is bad would the fuse stop them from working? Someone help! pulling out my hair on this one