O2 Sensor to track fuel pressure

An air/fuel ratio problem doesn’t necessarily indicate a fuel pressure problem. There’s lots of different reasons for being rich or lean.

A stock ecm with a powerlogger can accept a fuel pressure sensor which you can look at.

An aftermarket ECU like ECUGN can accept a fuel pressure sensor and monitor it for you, shutting down the engine if there’s a problem. It can also watch AFR the same way and shut down the engine if it’s too lean. In my experience the fuel pressure protection kicks in way ahead of the AFR protection.