Third gen. Camaro cluster in 67-72 Truck

[rscam]

I'm new but I thought I would throw out this question. I see many people on the board talk about gauges but I haven't see much more than just different variations of what is already in the truck. I have taken a cluster from an 85 IROC and held it in the hole for the cluster. It fits really good and it has a tach and actual gauges instead of idiot lights. If I try this what problems would I encounter? It is pre 88 so it will have a mechanical speedo. So I think all the gauges would be as simple as tracing the wires to each gauges(volts, oil pressure, fuel etc.) Please let me know your input. Thanks in advance.