I am impressed with this ScanGauge II. Just what I have been playing with so far is impressive. Need to do a fill up and adjust those settings.
I run mine in the US measurements, since ? liter per 100 km mean nothing to me. Mpg is what I understand. Did a search to find the maximum amount of fuel the MK IV will take and I think setting the gauge at 16 US gallons ( 61 liters ) will be about right. The most I ever put in was 16.43 US Gal ( 62.2 Liters ) when I did 1132 km ( 703 miles ) on a tank without running it empty.
When you step on the accelerator pedal it is amazing to see how the Mpg varies and I get a kick out of seeing it show 450 Mpg when you are coasting.
You can adjust the backlighting of the gauge in as many as 63 custom colors and I need to find out how to match it to the VW instrument colors a bit closer.
It shows boost pressure but it needs a bit of thinking, my boost gauge starts at 0 Psig and the ScanGauge at 15.1 Psig ( Atmospheric pressure ). Shows air temp being sucked into the engine, water temperature, voltage and so much more.