I would convert to mechanical & then use a speed sensor from 85-87 C10/85-92 R10 truck, it was mounted to the back of the speedo, prolly easily adapted to the 66 unit.


My \'64\'s in the Gallery
Pictures in my Photobucket
1964 C10 Custom Cab 350/700R4
1964 Suburban 350/700R4
1979 Ford F350 4x4 400/c6