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man, i've searched the net for hours, and can't find the info I need. Anyone have info on what otis/evic came on the '01's. I've got an '01 SLT with the standard o/h console. Trying to find out what system I can put in..... did I mention my wrist hurts from the moving the mouse....

Was driving the other day and noticed my overhead console display going haywire. I've had it on the fuel economy display lately & was pleased to see my mileage creep up with the warmer temps (got up to 19.7 mpg). Suddenly the numbers started to increase rapidly, about 2 tenths every second, then more like 2 mpg per second. The number kept on spooling up until it hit 99.9 then it stopped there. While it was spooling up I scrolled through the different displays & saw the miles to empty reading spooling real fast too. A few moments after it hit 99.0 I did a reset while I continued driving: it came back down to 2 mpg and then started to increase again but at a much slower rate, like a tenth every 10 seconds or so. It topped out at 27.5, then started to drop with stops & hills, eventually hovering around 24.3 to 25.2 until I parked the vehicle. Today I started it back up for the first time since the above incident. The display was right where it had left off at about 25.1. But this morning was in the 20s vice the 70s of the other day, and the MPG started to drop as expected, especially in the slow stop & go city driving. It dropped to 23.0 but went back up to about 23.2 after a short run on the highway.Naturally the present indicated mpg is inaccurate, but before the incident I feel it was functioning properly. Can't verify that until I fix the fuel tank leak that happens when I top it off (waiting for warmer weather). I guess that some connection went flakey, perhaps a fuel input from the ECM. And I guess that when I reset the MPG computer it should have reset to zero. I plan on resetting it again while stopped & see what happens.I'm not really clear on what the fuel economy reading is indicating. In the 2001 FSM it explains two economy displays; average (over past 30 gals) & instantaneous. Not sure what my '99 is displays. I read the owners manual & it wasn't very helpful.Any comments appreciated,Joe in St Louis