1978 Chevrolet Cluster?

[mountain-top-shop]

I have a question about the instrument cluster in my 1978 Chevrolet c30, it has the warning(dummy) lights instead of the 4 gauges that are in the 4 holes to the left of the 2 main gauges(speedometer & fuel). Can anyone tell me if the clusters interchange. Bottom line is that I have the instrument cluster with the warning lights in it and I want to change it to a cluster that has the 4 gauges(temp,volt,fuel,etc) and a factory tach. Are the wiring harnesses different or can I buy a cluster and plug it up and it work? If not what does it take to be able to put a factory tach cluster in my truck? Thanks for any help!