A Hood Tach offered by Direct Connection in the late 60's and early 70's. These were made by Dixco, an are the same as the Ford, Buick, and AMC OEM ones. The Pontiac Hood Tachs were also made by Dixco, but they used a different housing that is Pontiac-only.
Hood Tach on a Challenger
A '70 Challenger with all the kick-ass options, and a Hood Tach!