When installing an EBC (greddy profect b spec II in this case) instead of tapping a new boost line (from the FPR to intake) can I use the boost line from my MR gauges that I don't use anymore (its just sitting in the dash).

 

i wouldnt coz though it might be very ok, i'll be sceptical about it everytime smthg happens and blame the MR lines instead..

 

isnt the mr ones connected to the fuel pressure solonoid?

 

Thats what i did, no problems yet.

 

same here, i had the mr boost gauge, the ebc and a autometer boost gauge on the mr boost gauge lline. mine was tapped into the bov hose

 

Well...that depends on whether or not you want your boost gauge to read the same as your EBC.

I actually used the BOV line going into the top of the intake manifold closer to the UICP (as opposed to the FPR line on the opposite end). I really didn't want to cut into the fuel pressure lines at all.

I tapped into the line going to the EBC for my Defi boost gauge. Everything matches, and everything works well.