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If it's making the Tacho kick and flicker, i'd go a dollar to a doughnut its either the coil or the tacho itself.
But i'd try the coil first as it's more prone to ambient induced overheating.
If your car still has the coil mounted on the inlet manifold as some early 1850s did, try relocating it to the Sprint placement on the bulkhead. It's not MUCH cooler there but every little helps as they say!
Steve
Thanks Steve, James moved the coil to the bulkhead. I've made up a wire to bypass the tacho if needed and tested a spare coil on the car. I also found a poorly crimped connector on the low tension side of the coil - which I've replaced.
On Sunday I'm going to thrash it up and down the M62 to see if I can reproduce the problem.
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With a series tacho you mean a RVI? If so that one only senses the coil postive (half ac).
Then it's the coil or the feed to the coil. Another thing I once had at a customers car was the bypass wire from the starter was not attatched and sometimes shorted to ground on the starter housing. That causes a misfire also and a constant current trough the coil feed making the revcounter stop also.
Jeroen
Thanks Jeroen, all the wiring around the coil/balast/tacho seems intact and health, I've checked voltage at cranking vs voltage running etc.
Re-reading my previous post, it reads like we are setting off on the 10CR this Sunday - we aren't, it's a week on Sunday!