Cluster problem

Hi,

Suddenly the gauges for the tachometer, odometer, temperature, gas, stopped working. Then it started acting very weird like when ever there is a bump they start jumping then going back to zero. That happens also if I hit the cluster at the dashboard area I mean gently by hand. I found out that this happens when the temperature is really hot outside and even the small screen showing the mileage. I have the car for more than a year and half and this is the first time I see this happening to me.
i took the cluster out and I found something strange which I believe the previous owner has made and you can see the red wire in the attached photo is not connected he has somehow disabled that, but I do not know what does this mean.

Please help me with suggestions and if the red wire should be connected where should it be connected to.

Thank you very much,

Thamir.