You won't need the vacuum side of the gauge and you also don't need to give Summit the extra $140.
Buy
this one instead and just run the tubing straight to the gauge.
Check out
Ripster's install... You're looking for the slightly green (on my screen, anyway) tube penetrating the airbox just left-of-center in the first picture, on the driver-side of the radiator area. Another picture shows the tube (and his yellow EGT wire) penetrating the firewall grommet.
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'05 CRD Silver Sport
As Delivered:
Sunroof, Tow, 700mi
Warranty:
EGRs, TC & Pump, EGR FCV
After-market:
Guages (5), PIAA duals, Hitch & side lights,
AeroTurbine, Fumoto, 3.7L Airbox, Revos, Steps,
Cargo Tray, Hitch Rack, Bike Rails, & Slush Mats
