Goliath,
I have seen two people add gauges to their truck that look decent and is functional. I put my gauges in a custom-made panel where my little slot used to be in my center console. You can see it at my website. I have a voltmeter that reads both batteries and an air pressure gauge for my on-board air system.
Another guy on another board replaced his double din radio with a single din unit and put the gauges in the leftover slot below the radio. The good thing about that was that he could use standard gauges, I couldn't due to the small size of the console area. Unfortunately I don't have a website for him. His photos were posted on the board and are no longer there. But it was definitely a great setup. My setup works good, but his was great.