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The ECD-100 uses PID control of the cable speed to provide quick, smooth operation as well as preventing overdriving or damaging the speedometer needle. Consider this the most precise and easiest to use cable-drive unit on the market!
Solving   the issue with modern transmission being swapped to older Car when there no longer a way to spin mechanical speedo cable
The missing link between your cable-driven speedometer and late model electronic transmission! Measuring 5" X 4.1" X 2.15", the ECD-100 allows the use of a mechanical-cable speedometer to be used in conjunction with a modern drivetrain which provides only an electronic output.
|Make / Model||Series||Body||Notes||Year|
|CHEVROLET EL CAMINO STANDARD||1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972|
|CHEVROLET EL CAMINO SS||1968, 1969, 1970, 1971, 1972|
|CHEVROLET EL CAMINO CUSTOM||1968, 1969, 1970, 1971, 1972|
|GMC SPRINT STANDARD||1970, 1971, 1972|
|GMC SPRINT CUSTOM||1972|