Guess it depends on what you mean by: "make it ALL the functions work?" The VMSpc version of SL gives you all the enigine and tranny info--just plug the SL serial port into the chassis monitoring plug under the dash, in front of the passenger seat [9-pin adaptor]. Suppose its a bit bothersome to have to run the PC instead of a dedicated SL monitor, but since the spousal unit is already running GPS and mapping software, splitting/sharing the screen is no biggie...If you are wanting the minute to minute up-date of you holding tank status--that is larger challenge.....
2003 40' MDTS
Garden Ridge, Texas