If you can't make it work via the USB-Port, maybe there's another solution for people without LPT-Port. You already said, that using a USB converter doesn't work but what about a
PCI card.
I don't know how the Software adresses the LPT-Port but shouldn't it be enough, if there is a entry in the device manager "Printer Port (LPT1)" this should be possible with a PCI card.
I also don't know how big the difference is between a USB version and a LPT version. But program should be the same, only adressing is different? Then a working program with current patch and the adressing of the old one should be enough to have a running LPT version?
I think many people would sign if I say: Please give us an LPT version. At least for those people who already built their gauge.
KampfSchneggy