It looks like the Indigo FWC system utilizes the existing raw water pump and has a second electric pump for the other one. I expect this could make for a less difficult installation in a crowded engine compartment, as things are REALLY tight at the secondary drive location--flywheel end of engine, right?
Indigo:
http://www.atomic4.com/fwcelect.html
I will need to get onboard and really see the spaces in the main and accessory drive areas, as I'm not even sure I have much clearance near the main drive either.
Do I have the big picture here? If the Indigo system uses the existing pump with rerouted hoses and a remotely mounted electric pump, might this be more flexible for an install?