Here are four late 1940's-early 1960's electric tachs. Although I have no way to test them, all indications show that there's nothing going on that would lead one to think they would not work. For what it's worth, aside from the Sun with the bronze colored bezel, all the needles bob around when the gauges are handled. I do not have any senders for them, so maybe the new TachMatch gizmo would solve that: https://www.technoversions.com/TachMatch.html#TM1. (1) Unusual 6K (RB-7) Sun. $25 (See face close up below) (2) (***SOLD***) Late 1940's 4K ...unknown maker...fits 3" hole. Very clean. $25 (3) Sun RC-40 "Football" tach...fits standard 3-3/8" hole. I''l make sure a mounting bracket is included. $40 (4) Very nice 1963 Stewart-Warner "Twin Blue" 10K tach, which includes the original column mount. $335 All prices are plus shipping....$15 to the lower 48. PayPal (F&F) would be best, but a Postal Money Order would work, as well.