Tom and John,
Those temp guages sure are hard to find. I saw one on ebay in a year and a half looking every day. What I was ready to do before I found all mine(...in my own boneyard), was to use postwar guages.
If you take the big chrome bezel/ring off them they fit pre-wars perfect. The thin chrome ring is just right, domed glass-perfect, gauge face right size, clicks right in (needs refinish... & backdated graphics of course) Then, you hollow them out find any old gauges with right sweeps for the new movements and adapt. The cans will hold anything out there now. All that's left is needles.
A post war tach will work with just new graphics (maybe a needle). That's how I wound up with three postwar tachs before I found my own gauges. One was to be itself, a tach, one, the oil pressure gauge and one, because it was to cheap.
The remarkable thing is the is the mechanisms are brass so they don't corrode. Mine sat in the ivy outside half buried for 6 years. With a little drop of WD and some fiddling, they're all mechanical, I was able loosen three of them up to where the needles move and spring freely. I would not be surprised if they still work.
BTW. Yes that gauge panel pic. was right off ebay. Looks like it found a good home.