As JP states, NO "permanent" sealant for the bezels. Scroll up to my #16 post above. Here's another llink
>to Nisonger Instruments.< They sell the gasket set for all the gauges for skinny money, even with the cost of the shipping. Save yourself the aggro.
Otherwise, looks like some good progress!
That fitting for the oil pressure gauge had a small diameter flat seal for the seat, may still be in the ferrule? ISTR it was thin leather originally, but I may be mistaken. Again, no sealant, the fitting and ferrule are a tapered seat. Look for it on Nisonger's site at the same time as the gauge gaskets.
Keep us posted.