Jon/George
Well I got the tacho back from the repairer, and they told me that the distributor is a magnetic type and that it should power the tacho with no problem.
When I got the gauge tested he told me that there was a positive supply and negative supply but on the back of the gauge but the negative earth on the gauge wasn't connected.
When he connected it he said the tacho worked fine, so I guess I have to work out if the negative supply is coming back to the gauge.
I'll keep you posted, thanks again for the help.
Dennis
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