Take the vacuum feed of the FPR (Fuel Pressure Regulator) Dont take it off the D/V
Feed it around the airbox and into the wireing loom box that goes into the pollen filter housing ( follow thr red cable in my picture)
Remove the pollen filter, behind the filter you will find a gromit
Push the pipe through here.
Now remove the glove box and route the pipe under the dash to where you want the guage
I took the electrical feed off the radio but you can cut into the fuse box on the side of the dash on the drivers side.