I FINALLY ordered the Honda GX690 engine for the jetter I am building. They are so backordered that I had to get the model with remote controls which I'll mount on the frame. Tomorrow I will be ordering the Udor 8 gpm/3500 psi belt drive pump. My main question is which type of unloader valve is best? Should I install an engine termination switch in case of overheating? Do I even have to install a water tank if I lower the throttle down for 6 gpm? Does anyone know a good source for pressure washer frames? Thanks.