Just as an aside, if anyone is looking for an OBD reader, i have a Lufi X1 Revolution. Its great and is very compact...sits on the dash between the instrument bezel and the door pillar.
It may even offer more readouts than the Scangauge. It has 6 readout displays visible on the screen at any one time. I have mine reading; Oil temp, Water temp, Intake air temp, Exhaust temp, Battery level, and Common Rail Fuel Pressure. The transmission temp i have reading constantly on the dashboard as that is already built in.
The Lufi does also have an oil pressure option plus many other optional readouts too, but the Lufi doesn't recognise any signal for oil pressure from my Jeep....it might in other makes.
Unfortunately Volvo is not on the list just like all the others. If the temperature Stays below about 90deg when towing, now that I have fitted my factory optional trans cooler. Im not going to worry about a dashboard gauge. I have my old dinner plate size data scanner that sits on my wife's lap, just for testing purposes. As long as I know what is going on. Don't want to blow my gearbox up.