Gauge and wipers issues...

I do know that the fuel sending unit tests good and so does the fuel gauge. The thing that blows me away is the car had some dash lamps that where out. I removed the instrument cluster to replace the bulbs. Once out I disassembled the cluster and pulled the contacts out of the circuit board. SO I got a great used one. Put it all back together and the temp gauge and fuel gauge worked great for about a mile then both gauges went wacky! Of course I tested the fuel sender and replace the temp sender Didnt change a thing! I think its crazy luck that the IVR has a bad connection or just failed at the wrong time.