When troubleshooting a part-throttle knock, I needed to find out how my fuel presure looked under real-world conditions (not just at idle). So I built my own fuel pressure tester that allowed me to drive the car while watching my fuel pressure. You'll need: 16"-20" of 5/16" fuel pressure hose 2 - 1/8" pipe nipples 1 - 1/8" pipe coupler 1/8" female to 1/16" male pipe reducer 2 hose clamps (not shown) a fuel filter banjo bolt from a junkyard (free) Summit 0-60psi liquid filled fuel pressure guage ($20) JB Weld Teflon tape Drill Tap (optional) All you need to do is drill out the top of the banjo bolt and either thread in the reducer or just JB Weld it into place. Screw the nipples into the adapter bolt (after the epoxy has dried) using Teflon tape. Screw the nipple & coupler on to the guage using Teflon tape. Twist the brass fittings into the hose & install a small hose clamp on each end of the hose. Screw it into the top of the fuel filter, run it under the back of the hood and set the guage under the winshield wiper. Now go for a drive & see what your fuel pressure is doing. JB Weld is not fuel-resistant. Tap and thread that adapter, or braze or weld it.