No they don't make a specific one for the Xterra, only Frontier. So I did so molding and made it work.
Gauges all installed and working!
Instead of going straight out where the idiot light is connected. I went out where a 3/8NPT plug is located. I used a 3/8NPT to 1/8NPT adapter, 90-degree elbow, 45-degree elbow, and a 18" grease gun hose(which has 1/8NPT fittings on both ends. Then it was connected with a female/female connector to the sender.
Remotely mounted electric oil pressure sender. A band clamp grounds the sender if you don't directly connect it to the engine.
Voltage runs at 13.5 volts while truck is idling.
Oil pressure runs between 20psi+ idling up to 65+ when under heavy throttle.
I have more pics and instructions if anyone needs help doing this.