1993 F350 xlt 7.5 gas e40d trans 4x4

I've added a trans, coolant, oil pressure, and voltage gauges to my truck. They have worked great.

Let my brother in law barrow the truck to take some kids from our family camping . He was familiar with my truck but not sure about what temp ranges the gauges should be at.

I want to add some type of green/red makings on my gauges so when I let people like my brother in law or parents barrow my truck, they can easily look and see if they truck is running normal or not.

What would you say is a normal operating range for the trans (with and without towing), coolant, and oil pressure? And at what temps would it be time to pull over or near overheating?

thank you for your time