Bliss, Rick's idea of flipping the dash down is a good one. It's just six screws around the perimeter of the dash and it tilts right down. That will give you easy access to the wiring. A job like this is always much worse in your mind than it is once you've actually started working on it. Dropping the dash, 10 minutes; inspecting the wires, 15 minutes; running a new straight shot of 10 gauge between the fuse box and the circuit breaker (right along the engine side of the firewall, no need for it to go back under the dash), 20 minutes; repairing one or two slightly toasted wires, 15 minutes; installing a new voltmeter, 20 minutes; button it all back up and check for misplaced tools left under the dash, 10 minutes. See? Rick could easily have it all done in less than two hours (I could easily spend all day on it). This is not a hard job and it will be difficult for you to break anything new while you're doing it.