Interesting, as I have the same thing happening in terms of running cold seemingly. Your picture there is where mine runs almost all the time after it warms up. I don't think I have ever even seen the needle go to the halfway mark since I modified it. Just put a new radiator and t-stat in also, and yes, it is factory Toyota t-stat installed correctly, as was the previous one that acted the same on the gauge. Perhaps I should check out my actual temp sensor.....
After a tremendous amount of reading and searching and asking, there should be some additional info to factor into the normal operating temp of the rig. The new oem headgasket's #6 water jacket is shaped so as to restrict flow more than the original. The theory is it allows more heat sink away from the #6 to the coolant. This design difference raises normal water temps from 188-192 to 195-204 based on my readings. The cometic hg's #6 is more closely designed like the original oem gasket and should produce a little lower normal operating temp, but I can't confirm this.
It's well documented the effects of proper cooling system maintenence and the many things we can do help the system to perform better. But, if we keep using Toyota's published number for a stock 80 as a baseline after new HG's, armor, extra fuel tanks, bigger tires, etc., we could all be chasing ghosts. I am completely comfortable with my water temp at 207 on a Houston freeway running 70mph in 98* sunny weather with ac on high. I would have never been comfotable with those number had I not spent hours reading threads and pm's.
We need a definnative temp thread so people can compare like rigs to like rigs under similar scenarios. In my example above, if I posted I was running 207 and provided little else, it's just a number. It's context that gives it meaning. Even the above context would need to be expanded to be effective.
I hope this adds some value to this thread. I have had the RT temp guage mod for probably 90k miles and she's working like a charm. A very scary charm when she gets near the red, but a charm none the less.
Just tried to order these.
The 110 from Mouser was going to be $5.99 in shipping costs to 40601 (Kentucky)
The 50 at Newark, I was denied an account when I went to checkout. You have to register at Newark apparently just to purchase and I filled my information in and was denied. This one is on sale right now. Not sure why I was denied. Maybe they don't like selling so few of something?
Originally Posted by tonyteb
Australian Supplier for the 2 resistors
Wirewound Resistors - Through Hole 3watts 110ohms 1%
Wirewound Resistors - Through Hole 3watts 50ohms 1%
Seems all the sources now won't ship in singles for the 50ohm. Understandable. Not worth their effort to pick and pack. Still, not willing to spend $100 on this mod and I've got shipping issues from US suppliers. Anyone want to join in with me and get the price down? If three of us were to share the costs it would be worth doing IMHO.