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Wow, that tube looks awesome running.
I set up the improvised high voltage supply to 250V DC per the data sheet and then dug about for about half an hour to try and find a 22K resistor which was 1W or larger. No joy, but I did manage to find some resistors that match the tube. Some 12K 2% resistors, they look like maybe 2W. Put them in series and we get 24K, or 23.5K in ths case because they aren't in spec (although now that I think of it, they probably are - just, It's about 500ohms out, the 2% gives you 240 ohms leeway each)
With that in place I measured the short circuit current at 8mA. I adjusted it down a bit further to get the current down and ended up with just over 6mA and just over 180V under load.
Next I quadruple checked the datasheet to ensure I had the right pin for the Anode and applied the 180V to the Anode. Then I grounded each Cathode and watched the digit light up. You can see in the photo the number 5 lit.