Gauge question
 

I have a 1990 xj. I am in the process of installing mechanical oil pressure and water temp gauges. I am not sure were to install the probe for the water temp and was hoping someone on here has done it. As for the oil pressure gauge i think i can remove the electric probe (rite above the oil filter) and screw in the hose for the mechanical one. Any help would be great!

You have two water Temp gauges already on there.
You can use the one on the back near the firewall.