Used 9K Stewart Warner Tach and drive cable to fit engines using a mechanical drive off of the distributor.  Stewart Warner part number D-535-AH. Flush mount with mounting bracket. For approx 3 5/8" hole in dash, or could be mounted in a chrome cup. The common application is 1963-1974 Corvette, but many racers used a Tach drive distributor in their race engines. Also some Dodge Hemi applications in the 1960's.  Clean with mounting bracket and useable cable.  Very nice used shape.