1966 su Amazon - Scopri tutte le novità AdRisparmia su 1966. Spedizione gratis (vedi condizioni) 1966 GTO Tach Issue - Pontiac GTO Forum Hello, New GTO owner and new to the site. Thanks to all for any help and I look forward to helping others where I can. Well here is my tach issue. It 1966 GTO In-dash Tach - Pontiac GTO Forum Just joined.. a problem. I have a Burgundy '66 GTO 4-speed tri-power with an in-dash tach that doesn't work properly. Been under the dash.