If I had one to add, it would be a Fuel Pressure gauge.

 

Gotcha, I still would have liked to see it! Ha ha.

 

Over kill...and besides you dont want to pay for a part with an FAA-PMA part number on it!

Ive been using a gauge from automenter for the last 8 yrs or so...simple black face..white numerals and and orange needle. Looks just like the dash. You only will need the boost gauge for initial set up and perhaps trouble shooting later. Its not something you are going to be looking at constantly, trust me. Its still a must have though. Get one with vacuum as well

 

Innovate makes a nice one..

 

This is the one I picked up for AFR



Boost

 

The nicest solution I have see was someone (Porken?) taking a boost gauge from 951 and fitting it into the 928 gauge set where the MPH gauge goes.

 

Are you looking for mechanical or electronic. I have an AEM analog electronic mounted on the A-pillar and it works great.

 

Just hook up a barometer then and call it a day.