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Some preliminary good news. Having the day off today, I heated up the barn and got to work on installing the MSD 8910 Tach Adaptor unit. I separated all the tach cables from the bundle of wires that run to and from the MSD. So all the tach wires (2) were rerouted away from the power wires and such. Spliced in the MSD 8910 and mounted it up in the nose, in front of the radiator cowling. It apparently likes a cool environment.

Started up the engine and the SW tach is a smooth as can be. No jitter or jumping. These are preliminary findings. Now, since I did change the wire route as well as installing the 8910, I have changed two variables. Sadly, I am not sure which of these changes did the "CURE".

Just to firm up everyones perspective... I have the Mallory Unilite electronic eye distributor with 605 unit in the distributor, the MSD6-AL box, the Mallory Power Conditioner and a ballast resistor on the red power wire 12v small.

As I get some time on this configuration, I will let you all know how this works.

With fingers crossed...