Of course that's all they have done, why would you think anything different? Hatsan just specs what features they want their compressor to have and Tuxing builds it exactly how Hatsan wants it and with the Hatsan logo silk screened on it. Hatsan spec'ed a TXEDT031 compressor and that's what they got. Air Venturi spec'ed what they wanted and that is what they got (but with their logo painted on it), same with DonnyFL and the Bigfoot.
Anyway, I have a Hatsan Lightning that has about 25 hours on it (certainly not trouble free but that's another story). I am very happy with the way the auto purge works and don't see any issues with the 'program-ability' of it. I have mine set for an 8 minute interval and am happy with that setting. In a normal top off from 3K to 4400 PSI on my 66 cu/ft bottle I get 3 purges, first typically at 240 bar, second typically at 280 bar, and last one when the compressor shuts down at 310 bar (approx. 21 minutes total run time).
My Hatsan has the digital programable gauge so you can set the auto shut-off pressure and the auto purge time interval. I believe if you want to try to replace your analog gauge with the digital one you will need to buy the correct control electronics module for a TXEDT031 compressor since it is the only Tuxing model I see that has the digital gauge. I have had good luck doing a live chat on AliExpress when I have needed parts. I explain what compressor I have and that it essentially exactly the same as a TXEDT031 and they don't have any problems selling me the right parts. Shipping always seems to be quicker than estimated. Here is a link to a page with a bunch of different electronics control modules. I think the last one with many more wires
MAY be the correct one. Good luck.
And yes, the digital gauge is 12 mm thread so you will need to source and adapter.
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www.aliexpress.com