You are fine to replace it with a single cable. The factory cruise does not alter the cable speed between the trans and speedo. I did this a few months ago when I switched from the factory cruise to an aftermarket unit. I couldn't track down a new cruise servo for my car. Checked it with the GPS on my phone before and after and it is right on the money.
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1969 Pontiac Firebird 400 Convertible
Don't drink and drive. I really don't want you as a customer
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