Faux tank gauges were in 78 and 79 only. I change timing belts every two or three years. A commonly found belt is from Gates. I don't remember the number right off the top of my head. They are cheap enough and the carnage that can occur if one snaps is worth the insurance.
That's my buddies 77 in the background. Those auxiliary tanks he's wearing I found and had intended them for mine. In the end, they didn't really fit the style of mine, but they sure did on his. I made him pay dearly for them because they are quite rare and desirable!