Speedo problem , changed cable , trans gear and gauge

I think I can take a little jump from a vintage speedo a lot better than these goofy video game gages found on new cars. Having speedo and tachometer sweep a complete ark and back to zero at engine start drives me nuts… What’s next a vibrating seat so you know the car is moving; oh yeah, Caddy now has this as an obstruction warning when in moving in reverse.

I suspect that the cable is bent a bit too tightly at some point causing it to momentarily fetch up once moving. Make sure inner cable is fully lubed, and cable has no abrupt bends.