Every mechanical tach drive setup I've seen uses what looks like a speedo hookup. Yours looks like a brass compression fitting. Like the guys at the HAMB tried to tell you, it probably allready has a vac built in. Why add a vac to it if it allready has one, right?
As for it fitting in the motor, did you measure everything? did you install the original and mark the housing and then compare to the Mallory? Where is the vac for the stock dist? Have you talked to any suppliers about the part numbers on it?
Focus
