I just created one and I need to put it on my N3. Any one know how to do that?

That looks Cool!

You will have a make a ISO of the stock Nav DVD.
Once the iso is made, open it using ultra ISO or equivilant.
Replace one of the stock gauges with your custom guage then save the iso, and burn it.

Had to chang some stuff but here is a photo of it in the n3. One problem if you look at the gage on the left you can see that when you get ride of the time gage it shows part of the old gage. Any ideas?

Hmm, I don't know. Maybe try some different colors.
I know with the D1 a lot of colors show up transparent or inverted.

No thats not the case. it is showing the bottom peace from the one that i replaced. i need to find out where it is.

perhaps your resolution is different than the original file... try opening the original guage art, and make sure you are using the exact same resolution and aspect ratio