Moroso 12k cable tach

I had a Jones/ Motrola in my 70 RR. The "tick toc tach" never worked, and the original owner had stuck a Sun in the hole from the back. I ran a few different ignitions --the old CD "Tiger SST" and I forget the other one were popular back then, and I could NOT get a tach to work

I scored a dual point hemi tach drive dist (top ball bearing!!!) for 25.bucks!!! This was in San Diego, early 70's. Did a minor spruce--up of the dist, bought a new Jones, and mounted it back of the dash, up against the tack hole. FIT PERFECT. the original dash hole/ sleeve fit right up against the face of the tach, I made a bracket to hold it in. Ran that tach until I put the 340 in the car.