Hi Guys
Have had problems with my VDO Classic tacho since installed when completing the hot rod.When the car is first started the tacho works great but within a minute or so the reading starts to rise and after about 3 to 5 minutes the tacho is reading about 5000 rpm when it's only about 1800 rpm.
The distributor is a electronic Accel 7100 breakerless.I have tried the MSD TACHO convertor and a few others with no solution.( The tacho has been bench tested and is fine ) I have also wired in a cheap tacho to the car and it operates ok and the vdo classic works fine on my sons car with a standard distributor.Any help would be much appreciated.