That is only a narrowband gauge, designed to connect to the factory-fitted o2 narrowband sensor. That's why it's cheap ('cos it's not much use other than to see if the sensor's working).

The sensor mentioned by the OP is a wideband sensor which has a much more useful output range. I had a wideband sensor and VEMS gauge fitted to my GTR Skyline and it was a very handy tuning aid.

Having the wideband output displayed on the 'peg would be cool indeed.