My tachometer stopped working a week ago, and I'm not sure what the problem is. For a while, the needle kept jumping around between the 1000 and 2000 RPM marks, and when I stepped on the gas, it went to 0. Now it won't even move. My mechanic won't touch it because he doesn't want to mess with British electronics, so I'd like to find a way to diagnose the problem and if need be, install a new tachometer. I also noticed that it started doing this after the hose line going from the intake manifold to an area right by the radiator broke, could the problem be related to that? And what's the name of that hose line anyways?