aint to bad, you look at VDO gauges that look oem or did you go for the hey look its modified look gauge??? Pretty much i didn't do the rounded vent plate cause the gauge wouldn't sit flush unless you built up a lip.

 

nice much more creative thn mine i just took the center vent and a hole saw that was a little bit smaller then my boost gauge and cut it slowly then filed it a little bit and poof

here is what mine looks like
https://www.audiforums.com/m_363391/tm.htm

i think im going to re-do mine using your diy (when i get a whole day off work)