How hard would it have been for them to install a vacuum referenced pressure regulator, or even a sensor like you're saying? There's a lot of "good enough for average" engineering going on in the power sports sector...
Like I mentioned. 15.00 for a 3 bar pressure fuel sensor. One harness plug and 3 wires.
Ecm gets its own trouble code. Example (Code 99. Fuel pressure insufficient). Immediately the customer knows there is an issue and exactly how to fix it
Read the service manual. The only thing that is not monitored by anything and it specifically states this is the fuel pump system.
Every single day of my life I get a call about Kawasaki with fuel pump problems Happened since 2003.