I have an 83 300SD and I want to have the Outside Temperature guage. My question is - If I purchase one of these units will it work in the standard intrument cluster? It appears that I have the opening to install it, but not sure of the connectivity to hook it up. I see some of these are 4 pin connectors, and some are 5 pin connectors. How would I know which one I would need without pulling the cluster?

Thank You for any insight you can provide.

Tim

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1983 300SD