Slick 60's

I have an electric 4000 rpm tach that I had converted about five years ago.
It worked perfectly with my gas engine.
It does not work well with my diesel.
I am running it with a Dakota digital box.
I would like to trade for a mechanical tach in good shape.
Tach is in this video

https://m.youtube.com/watch?v=TOijY-fpW50

I would also buy a mechanical tach if you have one

Hello bwf please check your pm. I will double check but i have a 4k mechanical driven tach either for sale or trade.

Will do thank you!