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Speedometer tube
replacing the speedometer tube does it matter if it is the hard black plastic or soft tube like a fuel line?
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I just went through this but I ended up having enough slack line in the original line to make it work. I had bought soft gas line and was going to use it because I dont think it will matter as far as accuracy. I dont think the gas line will last as long as far as cracking etc, though.
After getting on the water with mine hooked up, I downloaded a speedometer app to my phone. I was within 2 mph on my speedo.