The first thing to do when you have erratic reading gauges is to check and clean all connections. Pay particular attention to all ground connections. There is a major grounding point on the frame alongside the left front wheel. Remove the wheel, remove the wires and make sure that the connections are all clean and that the paint on the frame or rust isn't interfering with the connections and that it is tight. You can also remove all of the fuses one at a time and clean the contact points and tighten up the clips that they fit into. Check that the proper size fuse is in the correct spot, don't take it for granted as someone could have stuck the wrong size in or just switched them by mistake. For the tach you also should check connections around the motor for tightness and corrosion. On older cars very often the trouble is in the connections, not the part, but the simple act of changing things has the effect of "fixing" the problem because as you plug and unplug connections it cleans them. David Teitelbaum vin 10757 --- In dmcnews@xxxx, "John" <john_geuley@xxxx> wrote: > Hi, > > I have recently noticed that my rev counter is acting > erratically.. > > Whilst in tickover it goes from 1 thousand up to 3.5 and back down > etc etc... > > Has anyone had this same issue ? > > (I have a spare rev counter, but am not sure if the problem > is likely to be a sender unit ?? not sure what/where this is) > > Cheers > > John G.