B737 MAX 8 Captain reported the cabin pressure control panel went blank on climb out. The flight crew elected to divert to an airport where the part was in stock and make an overweight landing at the diversion airport.

Narrative

Climbing out; noticed that the Pressurization Control Panel went completely blank. Pressurization seemed to be working normally. No applicable checklist. 3-way phone call with Maintenance Control and Dispatch left us with the impression that the Pressurization Controller was probably working correctly but that our interface with it (Controller panel) would remain inoperative for the whole flight. No circuit breakers were open. Upon discussion among the Flight Crew; we decided that the inability to control the pressurization control valve and the inability to see the status of the control valve left us in a position where certain checklists (smoke elimination; emergency descent; loss of pressurization) would not be possible. We were told the part was in ZZZ versus our departure airfield of ZZZ1; coupled with an impending overweight landing; dictated the airborne divert to ZZZ. Dispatch ACARS'ed us the divert fuel parameters and we diverted uneventfully. Landed at gross weight 162;100 pounds; about 11;000 pounds overweight. There was a slight delay trying to get turned around to ZZZ due to frequency congestion. We probably had to fly about 40 NM away from ZZZ until ATC was able to work with us. No [priority was requested]; as the FOM clearly states that it is not necessary when exercising Captain emergency authority for an overweight landing only.