New Fuel Pressure Gauge.  If you are wanting to "dial in" the correct pressure for your vehicle, this is essential.  Installs in line.  This is a great item to figure out the best performance.  Reads 0-15 lbs.  This conveniently small 1-1/2" gauge will fit almost anywhere. The gauge has 1/2lb increments with a range of 0-15lbs. and has a 1/8" NPT male fitting.