Gauge cluster problem

So I have been having problems with my gauge cluster and first thing I have noticed is that the gauge needle was stuck on 20 mph and been acting up since two months ago. Everything works fine but that so I've changed the computer chip of the speedometer and it worked. Still went faulty sometimes when I drive so I bought a used gauge cluster from the junkyard and used the computer chip of the cluster from there and replaced it from my old one. When you put it back on everything worked but the speedometer acts just a tiny bit, but goes normal but the dashboard lights is not working. But my turn signal work check engine light etc. But except my whole dashboard no lights. Like I cannot even drive it at night and now I'm worried that I might have messed the wire up by unplugging and plugging back in. I just hope it's only the cluster itself because I banged it a little to show my light that shows. I'm not wearing my seat belt so could it be fault or loose wire or just get a whole entire used gauge cluster? But different mileage because I need to put the exact mileage on if it works if not. Please help!