Gauge cluster swap?

[Joe Z]

Having trouble with my gauges and figuring out what to do. The truck is a Frankenstein originally an 81' 6cyl Scottsdale. Now has an 82' cab and interior harness, 84' 350 and engine harness, and the engine is wired for factory gauges and I have the cluster for it from the 84' but the original truck didn't have gauges. Can I swap the green electrical circuit from the old cluster to the 84' cluster and make it work or what? I already swapped the clusters to see what would happen and all the gauges just pegged but the non gauge cluster the lights were on and just shifted for dim to bright. Not sure how much difference there is in the wiring between gauges and lights and the years.