Me too !!!
My first three gauges were from TST, DiPricol boost, egt, and oil temp. My boost actual states 'Manifold Pressure' rather than 'Turbo Boost', found on the newer DiP's and goes up to 60 psi's rather than 30 or whatever the new gauge goes to ( why did they change that ???).
My only complaint with the DiP's is that the egt. gauge does not have an illuminated needle, the others do and it really isn't easy to read the egt gauge at night. Maybe they have changed that since my purchase, something to consider though.
Other than that, the DiPricols perform as they should and overall I am happy with them.
As far as the drilling goes, consider it a right of passage. If you overcome the concern of drilling through a brand new and perfectly good manifold, the addition of other mods. to your truck will be a piece O cake in the future.
Scott W.