I noticed, when working on a '98 Malibu LS, that if I disconnect and reconnect the battery, the temp gauge may end up outside of the low-side limit (peg coming out to keep if from going too low). I've had to stick a fine piece of wire through the odometer trip button hole and force it to the right until it bangs back up to the top. You have to coordinate the pushing over of the needle with a key turn on after it's been pushed over. It worked correctly after that.