A broken pinion gear, on any make of outboard motor, is most often the delayed result of hitting something in the water. The propshaft should also be checked for any out of true if the gearcase is being rebuilt. Most of the time, broken teeth on a gear chew up the bearings and the finely machined bearing surfaces requiring a new gearcase assembly.
As to the engine temperatures, your motor is at least 9 years old, should have had a minimum of 3 complete dealer services or is due now. The water pump, thermostats, and the pressure relief valve assembly need inspection for temperature related issues along with a test of water pressure at all speeds.
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.
What should water pessure be at idle at idle seating still read out and gauge says 0 have to raise rpm to show any pressure. I have not got the gear case back on ordered the gears and bearings thursday just going by the 14 hours I was able to use the boat before the gears went out.