Installed a ScanGaugeII this weekend. Great gadget. It's a 1.5" x 5" display that plugs into the OBDII port and displays RPM, MPH, Throttle Position, Coolant temp, Transmission Temp, Intake Air Temp, Voltage, HP. Torque, Remaining oil life, MPG instant & Avg, Fuel used, etc, etc, and it displays trouble codes too. Awesome. Check it out at ScanGauge.com I bought it off Amazon.com for $159 and got $30 off for signing up for their Visa.