chrysler dash swap

[metal_mat]

Hey guys. Gota 1980 chrysler estate. The dash only has speedo and ive found one with a rev counter. Does anyone know what drives the rev counter on the models that have it?

[JoKer]

just a feed from one side of the coil will do it (+ve side iirc?)

[metal_mat]

Thought it would be cheers mate