OK...a dumb bunny question:

Just used a Powernail 50P nailer with 1.250" cleats to put down 1/2" engineered. Things look secure and all seems well.

As I reflect back, the instructions on the nailer operates between 80-90 psi. And the floor instructions recommend a similar pressure. However, 50 psi knocked everything home.

A little late to ask, but am I missing somthing? I hope not because there is now way I am starting over

A simple answer. The air pressure gauge was not reading correctly. You were probably at or near the PSI required but the gauge read it lower.

Thanks for the response.

Sure the gauge is not calibrated, but both the gauge on a brand new compressor and the gauge on the nail gun hose read pretty close to the same value. Coincidence?

If it set them, I wouldn't worry. Life is too short to dwell on something so trivial.

The engineered wood may have had an effect on the ease of the penetration.