I'm going to retract my recommendation for the Dashhawk, because I just checked the dashhawk support fourm and the key programmer has been reassigned. This product may very well be EOL (End of Life) with no future releases.

I am able to see and log transmission temps. Not certain about slip parameters, although I know there's a transmission trubine speed or something like that.
I've set up gauges (displays) for tranny temp, cylinder head temp, engine temp, fuel flow, fuel level, engine load, intake temp, MPG (may not be 100% accurate, but can be tweaked), O2 sensor voltage, O2 sensor temps, throttle position.

There's bunches of additional paramters that could be displayed, but aren't much use to me.