Best Scan Tools

There are other devices out there, but the ScanGauge is simple and reliable. It will show any of four selected parameters and be programmed to display information unique to your vehicle, engine and transmission. It plugs into the OBDII port and also gets its power from the port, so there are no additional connections or splices needed. This also makes the device portable between vehicles. I prefer this always on mode verses activating a smart phone app, connecting via BT and having to run additional power to keep your display active.

Edge makes a graphical OBDII monitoring tool if you prefer color visuals instead of the backlit letters and numbers of the ScanGauge.