The image of the knob shown in the Repair Parts Manual may be all we get. I drilled out the broken off brass shaft and tapped it. I threaded a machine screw into the shaft and now ready to find a knob and attach it. I will let you know what I come up with. My switch mounts to the switch cover plate with two small slot drive machine screws; not like the image depicts. The switch appears to mount to the sides of the switch box in the parts manual diagram.
I'd say the neon is a fraction of the value on that sign. you already have the can. Pretty sure the bottom link from above would be closer. maybe a little low? The one at 21.5K was part of the V8 sign which is smaller and more desirable. Plus i thought lots of that stuff sold at top end. JMO.
If you’re going to leave the guts in, take those components apart and clean the insides and/or soak the insides. I use simple green. It’s not too hard to get most pump parts apart to clean the inside. After all they had to go together at one point. You’ll be surprised how much gas can still be in some of the parts.
Repop plates are available. Waynes clocks may have them and possibly Petrorelics. Id try petro relics first. The edges are turned down on the plates. Ive seen lots of different layouts and font sizes and even some slogans on the plates. i have a repop plate somewhere . if it turns up, Ill get a picture and exact size for you. I wonder if the blue flaked off? It wasnt painted over? Id get that restored PS -yes -thats the date your clock was made . PSS. Heres another I have to show you how faded it is and how the painting on the numbers seemed to hang in there.