Ok I got it finished up. I put a rubber gasket like around the outside to make it more clean though the whole tach is sealed up with silicone. Since I repaint the whole thing I nearly bought a new sticker set or something to rebadge the back. [Don't want folks assuming its a fiero or camaro from the back, YUK]
But then I membered I had the fenders badges still. Gave it a little polish and it looked nice. So I stuck it on there. Almost put it on the rigth side hatch lip but the whole car will be painted again soon so that was a no go. Looks decent enough there and folks will know what it is.
If ya wounder this is what I use on the fenders.
[Rims are now black too. hate chrome.]