cheers for replies, yeah revs do drop a little when lights turn on or electric windows operated etc, cleaned up all earths and connectors today so will take her for a spin tommorrow, see how she is, my old man said it could also be the inline supressor thats in the green wire from coil that sits near inner passenger wing possibly breaking down these apparantly supress the electrical noise/interferance from radio etc which in turn stops the rev counter going nuts !