41 3/4 ton dash questions

[411Ton]

Gurus, have a few questions as I'm removing interior and getting ready to dip the cab.... first, there's this knob on the dash next to what I'm pretty confident is the choke, has the stainless bezel around it (see pic). I can't seem to figure out how to get this thing out of the dash? the bezel doesn't appear to unscrew from the front as the knob shaft isn't threaded, but I have no idea how to get it out? Second. There are these two (things/knobs/dials?) above the gauge assay that I don't know what they are. One points towards the driver and has what appears to be a bulb behind it, and the other sits above the gauges and points upwards. both sides are broken off, no wires or anything else, can't figure out what it may be? Third, there's a knob that's attached to the bottom ledge of the dash, to the right of the three forward-facing knobs. Appears like it has resistor wires like a heater element, but again no wires or anything connecting it to anything. The only remaining pieces of what was a heater is the plastic assy that passes through the firewall.
Thanks!