I am trying to get my 86 560 SL Cruise Control working.

I have replaced the Control Amp with a rebulit unit. Everything in the Cruise Control Actuator checks out. This leaves me with the Speed Output of the Electronic Speedometer. When checking from ground to the speed input from the speedometer I have no resistance. My question is how can I check to be sure that I am getting the speed input signal from the Speedometer?

Thanks for all help.

Dave
86 560SL

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Dave