Thanks 1P2M, I spent a couple more hours on it, but couldn't get it a lot closer, I got it a little closer, but I gave up. I didn't write down the closer one before I closed the page though. It's hard to get both ends and the middle close, It was almost one or the other, and that upper part of the curve from 80C on up a PITA. I will try again and write down the end product.
EDIT: I will get the center of the curve as accuate as I can and to worry too much about the extreme ends i.e. above 150C and below 0C.
OK, this one gets it within about 5C all the way from -30 to around 95C...I THINK! And it is the format TP 'should' recognize?
((-.055x+6.5)(-.026x+4.6)(-.024x+4.0))-((.049x+1)(.028x-2.3))+.04x+53
The upper half of the curve is just so steep it's very hard to get both ends correct.
I don't know if this page will come up with the graph and points in it already, but go here:
http://fooplot.com/#W3sidHlwZSI6MCwi...CIsIjIxMCJdfV0
It is nowhere near close above 100C, but I think if you ever get above 120C coolant temp (250F), you will have bigger problems than the dash display wrong.
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