[MetroMPG]

Quick search shows a number of people here have done this. Have you searched/read any of these?

http://ecomodder.com/forum/showthrea...ing-19112.html

http://ecomodder.com/forum/showthrea...ions-8434.html

http://ecomodder.com/forum/showthrea...fan-15287.html

EDIT: added....

I have a scanguage, do I even need a fan LED?

The SG doesn't show how often the fan is coming on. It will only show your current and max. temps (FWT -- Farenheit Water Temp is the gauge label).

So it can only tell you whether or not it came on at least one time - if you know the preset temp at which your fan will kick on, and your Max FWT exceeded that on the current trip.