Searching on my phone is a little frustrating, so if there's a resourceful thread out there already link me and I'll be on my way. 
Looking to pick up a scan tool, is there one more valuable/accurate than the rest or are they all pretty similar? Leaning towards the ScanGaugeII at the moment, but open to other options. Not opposed to a Bluetooth set up, but would rather just have something that's installed and on at all times. Main concerns are water temp, fuel, speed and what not. Appreciate the help.

Looking to pick up a scan tool, is there one more valuable/accurate than the rest or are they all pretty similar? Leaning towards the ScanGaugeII at the moment, but open to other options. Not opposed to a Bluetooth set up, but would rather just have something that's installed and on at all times. Main concerns are water temp, fuel, speed and what not. Appreciate the help.