Speedometer problem

[Falcor31]

@Nacho-RT74 I think I fixed it, but now I need to adjust the tension, and I'm not sure how to do that. Care to help? I'm almost there! If not, I'll end up buying a junkyard one, but I'm afraid that it will eventually break, so I prefer using the one I fixed.

 

[Nacho-RT74]

Get a drill with reverse speed and known RPMs… a piece of speedo wire… or indeed the full speedo wire itself and all is about to make the maths

As far I recall it’s 1000 rpm’s for 60 mph.

If you got a 800 rpm’s drill, well, the speedo should read 48 mph…

Give an initial tension to the helicoidal spring before get the drill to spin, the adjusts back and forth