I've got an '88 240 Wagon, automatic. For some reason, lately, the OD stays on all the time. The little orange arrow is illuminated on the dash, and the button on the shifter does nothing. It doesn't seem to be too big of a deal, even on the highway. But, I am worried about a relatively long trip I have planned. It revs a little high at 65! The only thing I thought to check out was fuses, which are all good. Any ideas?