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Assuming it's a mechanical speedo, you can bring along a cordless drill. Chuck what I believe is a #1 square head bit into said drill (about $5 at Lowe's) and insert into the back of the unit where the cable would normally go. You can then spin the drill to check for proper operation.
We did this with a junkyard speedo, but after we got it home because I didn't have the tools with me at the yard. When we found the replacement to be defective, though, this saved us the time and aggravation of the removal/reinstall process until we managed to stumble upon a good one.
Greg
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