Finally got my distributor synchrograph from a regional swap meet. I haven't checked the vacuum pump yet but all other functions are working fine. I have a separate vacuum source for checking vacuum advance canisters if need be. This is my spare Chevrolet distributor mounted up to test with. I'll go to town on my AMX distributor sometime in the coming weeks and get it dialed in. Dwell is functioning, RPM is functioning and the all important synchrograph feature is working as well.