Yes, I have one installed on my 72 FX. I like it very much. Three lights (Lt to Rt): Gen -> HiLO beam, Blue -> Nuteral and Oil -> Oil. That's how mine is connected. My shovel has an alternator and not a generator.
Yes, they do sell them as a bag of parts. If you have the kit: lots of spacers, frame, lock/switch, cover & retaining nut, screws... No instructions.
Getting it to fit correctly on my 3.5 gal tank took patience. I did it over the winter. The hardest part for me was getting the console frame to sit at the right height relative to the tank. So that the cover would sit flush agianst the tank when installed. I ended up using all of the spacers and some of my own washers to get it right. Ieven had to move the hole for the standoff that holds the cover on.
Next the ignition switch/lock was different from the orginal. I had to go back to the orginal wiring digram to work that one out on the new switch.
Basically, it's not a straight forward thing and requires customization. But I like it so much more than the tradition one. To me, it was worth the effort.
I had the orginal console but it was broken were the choke knob pushed in. Quit common I have heard.