Hi mike, thanks for replying mate. Problem is i do not have the old engine anymore and secondly its not off the flywheel its off the timing gear which i can not see. would it be possible to do a ratio off the RPM i posted? the 645rpm was the true value and the approx-380rpm was what was read on the dash board tacho. therefore 645/~380=1.69 if we round that to 1.6 could we not find/make some sort of pulse multiplier which takes the pulse signal and multiply it by 1.6?
cheers Ash