Speedo cable was broke when I got the Willys. I replaced with new cable. New cable worked fine for the first little while but now it’s fine below 30 mph. Over that especially around the 40 mph mark the needle goes bezerk starts jumping, makes noise and spins clockwise back to 0. If I let off on the gas and get it back to 30 mph it settles down and operates normal until speed goes up and then the needle jumps and spins wildly again. I checked fittings on speedo at both ends. Both are tight. What can I do?