1991 K1500 project questions

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Recently picked a V6 5 speed K1500 truck with six bolt wheels. Does this make it a heavy duty 1/2 ton or did all 4WD 1/2 tons use six bolts. Although the truck has many minor problems the body is rust free and when you hit a bump the entire truck moves together rather then as a collection of parts. It feels solid. The hood alignment had me worried about the frame but it runs straight down the highway.

I am looking for the dash cluster schematic with the pin numbers for the connector. I am having problems with the cluster illumination. All the gauges work except the mechanical odometer which is worn out.

Thanks