Do I NEED to replace the oil pressure gauge before the long drive? In other words- Is this fix 100% necessary in order o road trip with this car- will it cause catostrophic failure?

Also, there was oil in the brae booster vac line about a month ago as well, so I am thinking that this is a 2 part problem- vac pump diaphram failure and oil pressure gauge leak?

Also, I don't have automatic door locks if the car sits overnight so there is definitely a pattern here.

Ben