Ya thats a good point, it shoul go out anyway I suppose. Just replace the relay.
FYI, the sensors are at the back of the head below the cam sprocket, and at the front of the head just below the forward most glow plug. The rear one runs the glow plugs, the front one is for the temp gauge. Don't know what the readings should be, but if your gauge works correctly you could just measure both and compair. I don't think thats the problem though.
Jason
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