I have one of those. My thing is it's very hard to switch to reserve while riding. The handle is set way back in the bike. At least that's how I would describe it. As far as install it looks straight forward to me.
YUP!!! Reminds me of all the bikes I had, when young! We never had......and obviously don't like the vacuum operated ones of today.
Learn where the fuel valve is on your bike, by memory.........even if you need to "reach" for it!!