Not sure about the standard vs metric issue, but the time is easy. Set the display on time and then hold down the bottom of the display select switch for about 3-5 seconds. You will see the first digit start to blink and then you can let go and use the same switch up or down to ajust the hour. I think IIRC, you then hold the bottom side down again to get it to change to setting the minutes. I just sort of automatically push the right places when I am setting it and I am commenting from memory.
Perhaps the metric toggle is as simple. Maybe if the gauge is on temp and you hold down the bottom it switches.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worthwhile
2004 Prostar 197 - Red on White
350 TBI, Perfect Pass, Heater, Shower and a whole lot of fun!