I don't see how you can get by without those. It would be like driving a car without a speedometer.Have you considered flow meters?
They use 3/4" plumbing and check valves under the tank, which I've found has too little restriction to let the soap get pulled to the pump. I've always used a good, high-flow 1/2" check valve and 1/2" hose with push-lock hose barbs. There's plenty of flow to run without cavitation but enough restriction that you don't have to throttle back the water to force soap and wax. IMO that's not something you should have to do.I have Coleman pumpstand