Selling a brand new in box still sealed PLX DM-100 OBDII.
This is a 52mm version, it plugs into the OBD port and can display values from there along with adding additional modules from PLX.
I also have a PLX 52mm gauge mount that is brand new still sealed.
PLX DM-100 OBDII - $300 Picked up.
PLX 52mm Gauge Mount - $10 Picked up, or free if you buy the gauge too.
http://www.plxdevices.com/ - For more details/youtube videos etc.