I currently have an aem afr and boost gauage. I have an oil pressure gauge on the way. Fuel pressure gauge under the hood. Any other important things that should be monitored on a built motor?

 

I like oil temp

 

Egt

 

I really like oil temp as well
One of the gauges I monitor most when driving spirited for longer periods of time

 

^ I like oil temp too. Also for cold starts, its good to know when your oil is at optimal operating temp/good flow before pushing hard (especially if your running a thicker oil).

On a cold track day at Auto Club Speedway, it took 10min idle startup + 2 laps (normal low rev/boost driving) until my oil temp hit 180F. I was on Dominator 15W-50