Be thankful you do not have factory air or you really would be using or learning new words trying to access the cluster while working in the confined space.
The cluster attaches to the back of the dash so no screws in front to remove and bring the cluster out. The wiring is also wrapped around braces or connected to switches so even if the cluster unscrewed it would not move very far. About the only description and photos you will find are in section 13 of the 55-6 service manual
https://www.packardinfo.com/xoops/html/downloads/servicemanual5556/Sect13_Instruments.pdf and a few more photos showing more of the back of the entire dash in the field install instructions for the 55-6 factory AC system.
https://www.packardinfo.com/xoops/html/downloads/55-56ACInstall.pdf Short of removing the dash -- a major project and only helpful if doing other work, the only other access is to find a comfortable way to work while laying down and reaching up and under the dash. You can do as most do and kneel on the ground and contort yourself. If you anticipate an extended session such as when rewiring you can drape yourself over or even remove the front seat (a project in itself because it is heavy) or use some cushions to raise the passenger side floor to the height of the hump and lay on your back from that direction. You could also make some kind of platform and extend yourself out the drivers door. None are comfortable positions and something will always be in your way. Good lighting under the dash such as several of the new and small LED lights are a big plus.
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