Howdy! I picked up an old Sun Super Tach 2 this morning at the swap meet, anyone know what years these were made?
Made by various "Sun" licensees from the late 70's to present (Sunpro). More than likely yours is by Actron.
Pretty sure I bought one in '78, wanted a chrome Super Tach but they were higher $$. Still have it, I'll see if it has a mfr date.