You'll want a 52mm VDO gauge if you want it to match the rest of your instruments. VDO do a 15PSI and 30PSI gauge. The 300TDI should do close to 15PSI on full boost. I have a 30 PSI model with the part numberVDO 150077011. You'll also need a VDO fitting kit with the olives, hose, fittings etc.
You'll then need to work out how and where to connect it. Either a t piece off the existing hose or tap the bung on the back of the intake manifold.
There's some good pictures at the end of this page
The *official* 300 TDi Performance Thread - Page 3 - The D-90 Source
'95 110 300TDI, F&R ARB Lockers, Twine Shower, Aux Sill Tank, Snorkel, Cargo barrier, 9 seats, swingaway wheel carrier, MadMan EMS2
'85 110 Isuzu NA 4BE1 3.6l Diesel, 0.996 LT-95, Rear Maxi (SOLD)
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