Hey guys thanks for all the input on this issuse. Bought this tach from a guy who specializes in 66/67 Satellite only restorations. He has about 8 of them now so I would assume he knows a bit about them LOL. He told me a 66 tach was a 3 wire and needed another sensor in order to work, however the 67 tach had 4 wires and did not need the sensor. Mine is a factory correct 4 wire.

When I seen the wiring diagram I thought it strange the green wire was to the positive side but who argues with the shop manual. I will try the negative side as I also believe it should be there to pick up the pulse from the points or ECU. Will try this likely tomorrow and see what happens.

Thanks for all your help guys and will let you know.