One is a signal terminal and the other is an OUTPUT terminal. I'm guessing the OUTPUT would be used in the event I was not using a DRAC which already has a wire going back to the ECM and to the cruise control to make both of them happy.
You are right Scott, I only used the signal terminall on the speedo. The output is not used unless there is an external data logger or you need to have a seperate cruise output.
By the way I want to see what the final product looks like. Does your "good" bezel have the silver inlay over the top of the front face? If so that's awesome, I almost went that route, even had an NOS silver GM bezel to do it to, but someone offered me more money (and it was a shame to cutup a brand new bezel) so I sold the NOS bezel and went with a good condition free black one, and switched the silver faced gauges. I really like the black on silver, or silver on black, either way.
Yours should look real nice.
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