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Answered my own question.. today I was able to turn it over and rap the brass tube on the bench. The measuring rod and some dust crud fell out. I did a little scraping and pushed a few tubes of Acetone through with the bike pump. Glad I was smart enough to be careful where it was pointed cause it cleared out in a hurry. Now any fluid poured in the tube flows right into the glass tube. I took a picture of the "measuring rod" that was in it. 2" long and looks like a scrap piece of copper wire?
I am soaking the top in rust dissolve, then I am ready to reassemble. Not that a judge will look that close under the dash, but should I paint the metal casing to prevent rust? Or I guess a clear coat would let it look stock but prevent rust. Now to get the remnant of the vent tube out of the ferrule....