If so, any thoughts on the 'best' outputs (PIDs) to display?

I have the optional EGT & have fitted it the the RHS exhaust manifold. My existing traditional gauge is ready the LHS exhaust manifold. So I've got the EGTs well covered.

What else is worth keeping an eye on?

 

I watch oil temp, engine load, and voltage. I also have a Three gauge pod that has EGT, boost, and transmission temp.