Analog gauge to go with oil pressure?

I'm putting an Auto Meter Pro-Comp Ultra-Lite oil pressure gauge in the right hand pod of a Craven Speed FlexPod gauge mount. What, if anything, should I run on the other side? (I chose the FlexPod because I wanted a reversible "no drill" mounting solution.)

I'm also running a Scangauge 3. Are there any other important metrics besides oil pressure that the Scangauge 3 won't read? If not, I may not use the left side mount on my FlexPod, but I'm also considering a matching Auto Meter transmission temperature gauge.

 

You'll have to look up the codes but you can pull the trans pan temp with your Scangauge. I like to run coolant/trans pan temp along with RPM.