I would imagine the console for the 07 would fit on your C50 (tanks should be the same), but I don't know if the wiring harnesses would be the same given the fuel indicator differences.
Sounds to me like you're just concerned about running out of gas. All you need to know is when your blinky light comes on, you have a about gallon left and when it stays soild, there's about a 1/2 gallon left. You can confidently go 150 miles (at least) before worrying about filling up. I have gone as far as 175 miles and still didn't see the solid light (my blinky comes on at about 136 miles). I always reset my Trip A odometer at each fill and leave it in the view screen, so all I have to do is glance down to see how far till the next fill up.
Also it's important to mention when I fill my tank, I fill it only 1/2 way up the filler neck, NO FARTHER. (I know you're technically only supposed to fill it to the bottom of the filler neck.) If you fill it to the top, a lot will leak out all over when you stand it upright.
This is probably more information than you wanted, but I hope it puts you a little more at ease with how far you can go..