mag7

Hi everyone, I've just bought a zx TD Volcane 5dr, 1994 in top condition, 16in alloys stainless exhaust and k&n. However the rev counter stays still and will not budge. Is this a common prob? Also, what MPG can I expect in urban driving. This is my first diesel so any advice will be cherrished. The cam belt was changed at 55k and she has now done 106k with full s/h, how much longer to go? Thanx Jim :rolleyes: