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+1 on the Holley. Avoid the round, pancake style sold under various names.
I used the round one for a while. It was modestly OK at controlling the pressure. Then one day my wife called from her office to report that the GT6 was pouring fuel on the ground. The diaphragm in the regulator had failed.
I use the Holley adjustable. Use a pressure gauge and a T to set the pressure with the car running. Once dialed in, remove the T and there you have it.
The 1-4 PSI is the adjustment range. You plumb "in" to the center port and out either one of two end ports. If you want you can put a gauge directly in one of the outlets. Leave the gauge if you want to check the pressure periodically, remove it and replace it with a pipe plug if you are not concerned. The socket set screw in the top of the regulator is used to adjust the outlet pressure.
My "driver" is giving me fits with what appears to be changes in fuel pump pressure. $15 dollar e-bay pump might have something to do with it!:wink-new:
So far as I could ever tell, they come set just right for SUs as in our cars. I have the gauge installed, but no change I ever made to the unit changed the gauge reading, But the car always ran just fine.
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