WALBRO Pump for Carbureted System??

Sounds like your problem is different than mine. Fuel pressure was all over the place when it got hot in the engine bay. If you're just seeing a higher reading at warm temps it may be your gauge, as long as it's a consistent rise. Liquid filled gauges are well known for showing false readings at different temps but I do think it's possible for non liquid filled gauges to be affected by heat as well. Things expand when heated, it's just the way things work. I'm not saying you shouldn't change your setup but I would try something first. When you get back from a drive, wrap the gauge with a cold wet towel to see if the temp goes back to where it needs to be. I'm thinking that it's possible the pressure is staying the same and the gauge is giving a false reading. Just something that came to mind.

As for the gauge itself, I personally run a non liquid filled NOS brand gauge. The gauge in the pic shown above is a Summit brand and turned out to be just fine, but I figure a gauge intended for a nitrous application would be a good bet.