clutch safety switch

I have been looking all over for the 4 speed clutch safety switch and I'll be dammed if I can find it. I am pretty sure 72 Duster 4 speeds had a safety switch. The car starts without pushing the clutch which is kinda dangerous. I can see someone getting in the car and turning the key while it is in gear. No doubt it will fire and take off. (not good). Can someone tell me what I need to do? I think it has been rigged to start without pushing in the clutch.