Not just any fuel pressure gauge for a j-spec (don't know if it would be any diffrent) 13bt, one thats easy to install and useable inside to car or easily mounted behind the hood or through the windshield creamer spray hole on the hood.

 

You'll have to mount one in-line.

http://www.jegs.com/webapp/wcs/store...tegoryId=10677

http://www.jegs.com/webapp/wcs/store...tegoryId=10019