I also own a 2000 jeep cherokee from new and can tell you that after 80,000 mi. You will need to replace the hoses and thermostat and do a complete flush of the system. This will prevent you from having a break-down around 102,000 mi. Like I did.
Chances are that if you are losing coolant, you have a bad hose somewhere. I live in the mcKee's Rocks area and I use a repair shop called C&D Auto Service located right on Chartiers Ave. Across from Pat Catans.
They have been reasonable and fast. Oh and before you spend good $ on sensors and such, try disconnecting the battery for awhile (15 min.) And then reconnect it. That should solve the problem with the oil pressure gauge.
Unless you like spending money on your Jeep.
Wednesday, December 24th, 2008 AT 9:00 PM