Vintage rev counters...

[Howard Wright]

    Hi Jon

A hole directly under the distributor drive would indicate the possible take off point for a tachometer drive. 

I turned up a thick tube that just slide down the distributor drive shaft in the housing and was a sliding fit to a long drill I have.  That ensures the hole is directly in line with drive shaft.

The cable I used has a fine M12 thread connector both ends and fits the tachometer at one end. So I drilled a short length of studding to take a brass rod with a tongue at one end to fit a slot cut in the base of the distributor drive shaft.  The other end was drilled and filed to form a square hole to take the drive cable. I silver soldered a thin washer on the end of the studding to form a collar.

Hope these pictures help

Cheers

Howard