Scangauge 2. i paid $180 from camping world and it was the best investment for my 6.0L when i had it. you are able to monitor the EOT, ECT, ficm main and logic voltage, as well as many other vitals and it just plugs into the OBD2 port.
2013 F150 FX4 SCREW Sterling Gray Metallic
-Roush Side Exit Exhaust
-S&B Filters CAI
-Tough-Light 20" light bar in bumper