If your rev counter is a second generation unit (without the external sender) and you have the armoured cable coil you should have a wire that runs from the single post on the coil to the rev counter and then on to the distributor. The wire is continuous on this run and is looped around a contact on the back of the rev counter and held in place with a small plate and nut. This loop provides the pulse sent between the coil and dizzy which is picked up by the rev counter.
My car is a 1969 model 1800S with the B20B engine and the second generation rev counter. I have no idea how the first generation rev counters are wired up.
Next time I am at the garage I will take some photos of the wiring is this would help.
Happy motoring!
Alan
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