OBDII scanner / gauge

Dash Display Gauge 

ScanGauge II with XGauge by Linear Logic $160 
Bull Dog Heavy Duty WatchDog Multi-function Performance Gauge $450 
Edge Insight CS2 $327, CTS3 $500 
PLX DM-6 2 1/16" Touch Screen Multi-Gauge $110 
Banks iDash Pro/Data Pro $420