1995 Dodge Stratus. Gear slipping out

I have a 1995 Dodge Stratus, 4 cylinder, 2.4 engine. It will "slip" out of gear. I can start it up and drive fine sometimes. Gears shift just fine. And then all of a sudden stop at a light and when I go to excelerate, it will take off but will not shift past 10 mph.I can sometimes put it in nuetral, turn it off and turn it back on (while the car is still going) and then when I put it back in drive it will shift. But that doesn't work all the time. It also sometimes while i'm around 65 mph (gears had shifted fine) just slips out of gear like the car was put in nuetral. Just revs but no longer is actually driving. We just replaced the input and output speed sensors and it did fine for about a week, but today. Started doing it again. Also, I noticed for the first time today, when it does slip out the P R N D 3 L screen on the dash that shows you what position you are in. Every single one has a box around it like nothing is selected. And when I stopped the car, I put it in park. All positions stayed with squares. Then I put it in reverse and the neutral (N) was lit up like the car was in neutral. Then I moved it to neutral nnd they all were selected and then I put it in drive and again the neutral was lit up. Not the drive. I turned the engine off and restarted it when I shifted to drive, again the neutral was selected so I turned it off and started it again and when I put it in drive, the D was selected and it excelerated and shifted fine until I got home. Some days it does fine and others it slips out constantly, but I noticed the shifts not lighting up right today so any help would be greatly appreciated. Oh and the rpm gage also works sometimes and other times nothing. It will go days without working at all and then all of a sudden it jumps and starts working and then the next time you turn the car on, it isn't working again.