So the problem was is the cluster. I am happy that you managed to save the money. That is always good news. Bad solder joints are much more common than you ever imagine on all vehicles and even household electronics.
The problem is that the average individual does not have the ability to solder a circuit board without damaging it much less locating the bad solder spots and/or identifying failed components. I can't tell the average consumer to look for poor solder joints, blown capacitors, or how to test internal electronic parts as they will be so lost neither I or they will ever find their way back home.
I see that you have the abilities and are capable of locating and repairing such problems.
At work, there have been MANY and MANY computers, heater control panels, radio displays, instrument clusters... that I have disassembled, inspected, and repaired with simply soldering a bad joint or replacing a burned $0.75 capacitor. People are happier than ever knowing that a $750 computer was fixed with $2 worth of parts and $100 labor fee. It is when the processors, timers, rams, and driver controllers go out that a problem is untraceable since there is no visual problem.
You should have seen me tackle my LCD TV that let the smoke out. $14 worth of capacitors, one thermistor, 2 fuses, and some careful soldering saved me $1200 after a thunderstorm power surge. My old lady thought I was nuts until she saw the thing light back up with a clear picture! I was right I told her!!! I think that the house got hit since the surge protector fried and the electric company's surge box in the garage was fried. I had no power for 2 days until they replaced it.
It is a great thing to repair things rather than replace, is it not? I find it rewarding.
I will be looking forward to further updates from you.