It's kind of up to you. You can read the Riv OBDII port with one or another of the Bluetooth OBDII dongles along with appropriate software for your smartphone or laptop.
Think of it this way: The object you are scanning (the Riviera) has not changed, and people who've already paid for their readers/scanners aren't that likely to change unless they are in the auto repair trade, wherein the technology in the newer autos has changed in ways that obsolete the old diagnostic equipment.
Because the Riv has not changed, you can do about anything to a Riv with a Tech I (don't need a Tech II). You can get the OBDI - OBDII cord for working on the 95 Rivs (see http://www.ebay.com/itm/GM-12-Pin-OBD1-to-16-Pin-OBD2-Convertor-Adapter-Cable-For-Diagnostic-Scanner-New-/272287719408) provided you have the right scanner.
So... you probably already know what you need to know, combined with the scanning posts that are on this site, to monitor KR and a bunch of other things (coolant temps, fuel, and such).