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Thanks for the replies, It's not a 123ignition it has a separate power module which is fed from the ignition via the tacho with an old 12v Lucas coil and no ballast resistor.
I have a123 on the Jag and the tacho runs fine off that, just linked to the neg side of the coil with it's own power supply.
Gordon I'm sure it was OK when I got the car although as the problem seems to be intermittent I may have missed it.
Edited: I've just been and started it and the rev counter is working fine, I think the problem may manifest itself when it's warmed up so perhaps it's a rev counter fault and not the wiring although I have had to replace a few of the multi bullet connectors so one maybe another one is breaking up.
Last edited by Tim Falce; 22 Nov 2014 at 11:48.
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