I just got a 1987 300sdl and the speedometer/odometer are both not working, Ive searched the forums and found several extremely helpful posts about possible causes for the odometer failure and resources to get that repaired. Does the odometer have to work in order for the speedometer to work? These speedometers are electrical as far as I can tell, any advice would be much appreciated. where should I start? Pulled cluster out things look ok there nothing seems to be disconnected.

thanks

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1987 300SDL 257K