This video is going live about twelve hours after Colin left for Plymouth in his 1964 Plymouth Fury. I know this will come as a shock, but he's already had some minor issues. But that's another story - today, I'm going to figure out how to fix his fuel gauge, so he'll have at least some vague idea of when he will run out of fuel over the course of his 6,000+ mile drive. To do this, we'll use a Power Probe to diagnose gauge circuit issues, and take another look at how these often-dead gauge circuits function.