Thanks for the input. My thing is that I'm going to be running 3L split-port heads, so I have to do something. I've got the Davies-Craig EWP mounted to an engine on a stand and the hose routing is done... now I just need a booster pump for heat since I have the old POS controller, and It'll be ready to install. I plan to use dual-color LED's to indicate pump operation of both pumps. The booster will be a constant-on and the main will be set to come on at the lowest possible temp... that should give me a little breathing room for when it fails. I AM still tossing around the idea of somehow mounting an electric motor to the factory pump... but at this point, that will probably just be my backup for when the EWP takes a sh*t. I'm also tossing around the idea of leaving the t-stat in, but haven't made up my mind for sure on that yet.