I assume I might still have air in the system, despite the new tank. Back to my pictures, I believe I should probably cap off the existing radiator somehow and run that tee where my current temp sender is. I get this idea from
http://www.pirate4x4.com/tech/billavista/Cooling/. If I had to guess, I'm getting some very high temp readings in part due to the sender being at the hottest coolant point, but also perhaps because it is where air would most likely trap due to it being the highest engine point.
Quote:
If your engine doesn't have steam ports, and the rad is lower than the top of the engine, the bleed line to the surge tank must come from the highest point on the engine because this is where steam and air will naturally gravitate and get trapped. A fitting on the water pump in the same passage as the outlet to the radiator can be a reasonable compromise.
If you add a surge tank to a system that already has a rad cap on the radiator, you need to permanently seal the radiator rad cap location, or at least install on the rad a cap with a rating significantly higher than the surge tank cap will have, so that the radiator mounted cap will not open before the surge tank cap.