Mountain Goat GL

So Im cruising up to Snoqualmie pass in my 86 gl10 at about 70, when the ECS light come on, then off, then on again. It stayed off until I got to the exit, then came on again for maybe half a minute. The temp was almost in the red, but thats normal for this car (more on that later). I rode the mountain for a few hours, then on the way home, about halfway from the top, to seattle, it came on again until I got the Bellevue, then stayed off. This was Tuesday night, and the light hasnt come on again, though all the driving I've done is around town. Should I start worrying, or is this just another one of the electrical gremlins these cars are plagued with? The other worrysome thing about this car is the temp guage goes up and down depending on if the fan, fog lights, or wipers are on or off. Anyone else with a gl10 (ea82t) deal with this?