I'm comin into the converstaion late in the game as usual so forgive me if I'm off track a little bit.

First off, stick to the old fashioned mechanical guages. The digital guages are known to not be accurate. The mechanicals are also much cheaper. The fuel pressure guage should cost around the $30-$50 area for the best one on the market.

Me personally, I am putting the Turbo off til the last of the mods I do. Guages, Fuel supply upgrade, exhaust, air intake, tranny, electronic chip and injectors, then the turbo in just that order would be my best advice, for what it's worth.

S300 will do u well. my brother has a 97 CTD with that and 300 marines in it. truck runs great but is a lil laggy maybe.5 seconds but spools to over 50PSI. Mechanical gauges are the way to go.