ScanGaugeII - Trip Computers + Digital Gauges + Scan Tool
The Ultra Compact
3-in-one Automotive Computer
Trip Computer - Digital Gauges - Scan Tool
The integrated Trip Computer provides realtime feedback while simultaneously tracking three sets of trip data. The Digital Gauges give you realtime data for your vehicle and the built-in Scan Tool allows you to read trouble codes and diagnose potentially expensive problems before they get out of hand.
All this in a small and simple to install unit that can be easily moved from vehicle to vehicle.
also has X-guage which means you can add your own guages based on things your OBDII computer puts out, in addition to the 12 they have... can display 4 of the guages at one time.
plus it lets you pull and clear codes.
Great for the price ($150 on the group buy)
can calculate all kinds of things including HP, MPG etc.