I could see some numbers that i thought might help id the tach but couldnt make them out.De sided to try and take the face off.When i took the chrome cover off it i found 8CYL stamped on the back and batt distributor with an arrow pointing to one of the terminals.I asume that that goes to the distributor cap only?Why is it marked dizzy and batt? Also whats the other termanal for,ground? I asume that its 12 volt joker but i dont know.Im geusing its mid 60s to early 70s.
1942 1\2 Ton
1951 1\2 Ton 55 willys cj-5
1954 and 59 Cushman Scooter
1960 Biscayne Sedan
1965 G/10 panel van
1966 C/30 Grizzly Motorhome
You know you're a 'Bolter when your daily driver is older than you are... My progress pics 
