On mine I have a tee on the temp sender side of the thermostat housing. The hose feeds the heated water to the manifold. I used braided steel with hose clamp end.
The return water just feed back into the water pump through the heat hose since I don't have a heater. The braided steel is 3/8" and feeds into the 1/2 heater hose. Would have been much cleaner if I could have run the braided all the way to the water pump. The inlet to the water pump could probably be tapped for a 3/8" pipe thread.
