Last night, I installed a new Holley carburetor on my 67.
The fuel line kit came with a fuel pressure gauge so I installed it along with the other things.
The car fired up and ran beautifully.
I noted the fuel pressure was 5 psi at startup.
I had the engine running about 20-25 minutes, just checking things over.
While I was doing this, I noticed the fuel pressure gauge was showing 4 psi, then 3 and finally 2 psi before I shut the car off.
During that time, the engine was running very well, no sign of insufficient fuel to the carb.
The fuel pump is about 3 mnths old.
My first thought was the gauge was wrong, but I'm not able to verify that unless I buy another gauge and swap it out.