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Anyone know what the factory engine temp gauge lines actually are?


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Has anyone ever hooked up an aftermarket engine temperature gauge? I know the factory gauge says 190* on the middle mark but does anyone really know what temperature the other marks are supposed to be? You go from 190* in the middle, to the next line, and then nothing until 240*. Thats a big number jump to not know whats in between.post-131-138698180452_thumb.jpg

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is there some science behind that? if there is i am running colder than i have been thinking.

I am going by memory but pretty sure thats what it ran. I used to have an analog gauge in there as well so that's how I know. 1998+ trucks have different gauges so that might be a little off from your's. My old crappy thermostat would always peg that upper line and I remember always seeing 210-212 and then it would fall to the lower line which was around 150. Now it gets to 190 and drops to 185 and stays in that 5F area.
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Results are in... I tried using a rheostat and the lower values are easy to hit but the upper value kept doing werid things so I went to resistors and stuffing different resistors into the plug. Tidbit though... I found out the lower the coolant temp the highier the idle is. At 0*F the idle is like 1,100 RPM on its own...:stuned:Lower mark is 165*F...post-2-138698180471_thumb.jpgJust for fun to show 207*F...post-2-138698180479_thumb.jpgUpper limit is going to be 220*Fpost-2-138698180499_thumb.jpg

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