What year is the discovery? Petrol or diesel?
I believe a lot of them take the rev counter pickup from the 'W' terminal on the back of the alternator.
The only reason i can think of for the 500 rev difference would be a different sized pulley, so either swap it for the old one and it should be all sorted.
Leaving it as it is shouldn't cause any problems, will just read a little high.
Chris
Last edited by Chris_ : 31st October 2009 at 04:35 PM.
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