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Yes that's all there is. The OBDII port isn't fully OBDII compliant, it's more like OBD 1.5 and when fitted to the 850 wasn't fully developed. It wasn't until the 1999 models that OBDII came into its own

 

[parsnip]

The scan gauge Robert has is a genuine 'Volvo System Tester' which is specific to the cars from that era.

VOL FCR iLexa which is a computer based program will work only computer based so requires a laptop and cable in the car

The only other option is an old Android phone, the Google-Play 850 OBDII app and the correct Bluetooth dongle. Not all dongles will work and it's getting difficult to find one compatible with the 850.

Here is a link to a Bluetooth dongle that will work with the 850, the vendor is UK based so unsure if he ships to the States Click

I don't know how the tune is loaded, I would think the car's ECU is connected to a laptop and downloaded directly. Speak to Vast and they will confirm

 

[parsnip]

Oh yes, I've seen that ScanGauge II, could be a nice upgrade if you want all that info in front of you