Who ,besides Wilson, gave Tim sound advice?

His wife Jill! (though he seldom listened to it!) The same could be said of Al Borland as well.

And in the hair episode,that guy from the "Tool Time"audience who told him what happened when the guy's son came home with a strange hairdo,and while not exactly advising Tim,after telling him about his son not speaking to him and joining a cult and changing his name,Tim reconsidered and let Brad wear his hair the way he wanted,after making such a big fuss at the beginning.

And also,in the episode when Tim had the vasectomy,it was Harry the Hardware man who gave him sound advice.

thanks.........