Interesting... thanks for the suggestions. I'll have a look at the needles when I get a chance and then maybe try to find the rpm sensor and wires

Hi. I've just bought a 93 auto diesel Terrano. Most of the time the rev counter doesn't move at all (sits on zero), but sometimes it will just start swinging wildly all over the place. It does this both when driving and when the engine isn't running (like when waiting for the glow plugs ...