Classic/Antique Car Repair: Edsel Questions, overhead valve engines, edsel citation

Question
I own a 1958 Edsel Citation very low production VIN and I am trying to repair the factory installed tachometer.  It is driven by the distributor shaft, and I have the cable connecting it to the tach.  I do not see how the shaft drove the cable.  I assume it was a gear, but it is gone.  Can you help? The engine is a 410 c.i.d. V-8 and I believe the distributor to be original.

Also,  On the same car, my gas gauge registers as long as the gauge itself is not grounded.  as soon as I mount the gauge to the mounting posts, it goes dead.  Any thoughts?  Thanks

Answer
The distributor for the tach equipped cars had a drive gear assembly built into the side of the distributor and the cable attached like a speedometer cable. If my memory serves me right, and I cannot find any reference otherwise, it is the same distributor body that was found on heavy duty Ford trucks with overhead valve engines. As far as the fuel gauge goes sounds like a short in the gage unit.