you need the scanGauge D, I thought the scangauge 2 was only for OBD2.. and these busses use the J1708 6 or 9 pin deutsch connector which the scangauge D is msde for.. you can look under the dash for a grey or green connector and count the pins on it to get the correct scangauge..
my Dash set up is more elabotrate.. it uses a mixture of a commercial device (VMS-PC by silverleaf), a homebrew box and a windows tablet.. the scangauges are much more economical and will get you the data.
the Bluefire is a newer device that will beam data to your smartphone or tablet.. it came out since I built mine and looks really promising.. its also cheaper than what I have if you have a tablet or phone to use with it.
this is the 9 pin version of it (newer version that supports iOS as well as windows / android.
https://www.amazon.com/BlueFire-Blu...coding=UTF8&psc=1&refRID=CCFJ6HFH91SAYKT7G9AQ
this is the 6 pin version that works with everything..
https://www.amazon.com/BlueFire-And...=BlueFire+LLC&qid=1552459153&s=gateway&sr=8-3
there are slightly cheaper older versions of these devices that wont work with apple iOS if you are using android that might be an option.. but as with all electronics I usually opt for the latest..
this is the scangauge D that works with our busses..
https://www.scangauge.com/products/scangauge-d/
-Christopher
P.S. and if yopu want to go the same route as I did, I can give you pointers, but the above solutions should get you what you need at a fraction of the cost i have in mine..