"The January 2011 issue of Hot Rod Deluxe has a big article on restoring Sun distributor machines."
Really excellent article. (Getting an old Sun machine flashing is impressive ... however, knowing it's calibrated accurately is tough. They do not mention that.)
ALSO, can't speak for the Allen Synchrographs but the Sun Testers have some rather high voltages running through them. Be careful poking around inside.
