If I remember right, my 1974 had a setbelt interlock override button. If the system failed you could overide it. I thought this was a US item, so perhaps I am wrong.
Bob
Fast idle check switch... when you press it the engine revs rise as it actuates a vacuum operated assembly on the carb, to check CO levels in the exhaust...
Fast idle check switch... when you press it the engine revs rise as it actuates a vacuum operated assembly on the carb, to check CO levels in the exhaust...
SteveC