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Check the pickup coil (white donut shape with two wires coming out of it-you must remove the dist shaft from the dist housing to replace the coil) as suggested above. Had one that after a few years one of the wires broke due to fatigue and constant movement from the vacuum advance. And yes, the 12v supply to the dist should be there during cranking and while running. Means the latest thing you have done is add the tach, unhook the tach wire from the dist and see if any symptoms change. I would also leave it unhooked until the vehicle is running again. Once it runs, then hook the tach wire back up.
Randy
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'72 Cheyenne. AC, PS, PB, Rear slider window, tilt. Light yellow (grapefruit yellow according to new sales literature from '72)
'56 Chevy short step V-8 (My dad bought it new!!)
'70 Olds 442 convertible
'70 Olds Rallye 350
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