3 good gauges not from FMC (use their connectors). 2 0-30 PSI and one 0-30 in/hg. A good voltmeter. A Neo ll or other pressure/temp/condo testing device. A variety of tools including a 13mm wrench (UF pump adjustment.) channel locks, long screw drivers including 2 specially insulated ones for the circuit boards. Some stubby screwdrivers. A trimpot tool. A variety of pliers including a long needlenose. A set of metric nut drivers. A set of 1/4 in sockets. That's all I can think of right now.
A good tie wrap gun and hose cutter( I get those from Ryan Herco ). I also like to get my techs one of the better multitools to hang on their belt if they like ( Gerber or Leatherman ).
<Lumpy>
Posted
T20 hex tool for removing deaeration and flow motor end caps for brush replacement, soldering iron and solder, flashlight and a good magnifying glass for seeing things that cannot be seen with eye glasses.
The one that comes to mind that I do not use very often, but comes in handy, is a strap wrench. Those bowl filters that get REALLY stuck seems to work ok for me. Also a 90-degree #2 Phillips screwdriver.