IMO, if you have the time then clean it. Mine was running prefect, then I got on it fairly good one day and it stuck. I hit over 50psi in very short time. It didn't sound any different. The only thing I noticed was that it took a little longer to spool, not much, and then my gauge just wrapped around. From first hand experience, it will stick without warning and if you're away from home you're screwed. I had mine apart, cleaned, and back together in about 5 hours. Which also included a trip to the local NAPA for some cleaning pads and anti-seize.
As far as the re-learn. The DIY procedure is as follows:
Drive the truck and get it up to operating temperature after you clean the turbo. Don't kick on it at all. Once it's up to temp, unhook both grounds off the batteries, turn on your light switch, and let it sit for 15 mins. This drains all remaining juice from the computer causing it to loose it's memory. Hook both the batteries back up. Start the truck and LET IT IDLE for about 20-25 mins. You'll hear the turbo spool up and down as the truck re-learns it's total range of motion. After that time frame, drive it around easy for about 15 mins. Then a little harder for a few mins, etc. In about 40 mins you should be back to full "holly crap" and all will be good. Keep in mind that this procedure isn't as great as having ford do the learn process with the computer, but it's about 95% as good. Oh, and be sure the truck is stock before you do this process (if you have a tuner).
Gauges, IMO Isspro makes the best "matching" gauges to the stock trim. Black face, red pointer. In my A-pillar I have fuel press, pyro, boost, and water temp. (it's a 6-speed). Hope this helps.
