I was wondering where abouts on the gauge your temp shows when your truck is at normal operating temps. Mine is almost to the low side line. I did have my truck hooked up to a scanner and it was running at 180 but I think i might put a 190 thermostat in cause its a HO and that is stock.

 

pretty sure the consensus around here is that "N" is normal, maybe even a little "O". low side line seems low, but i changed mine 'cause it wasn't really moving at all.

 

Yeah between the N and O seem about where mine sits.. i have a 4.9 300 I6 though..

 

EFI engines run around 195 deg, I am pretty sure you can get a 195 thermo, if not, a 190 will work. A 180 will make the truck run a little rich.

 

I got a 180 in my 302 and it runs right on the n some times on the o, but it is also about 108F out side

 

yeah i had a 180 in mine, changed it out for a 195. i got it at my local ford dealer.