The 1968 C10 has a Digital Dakota 8K VSS installed on the 3 speed transmission.
https://www.summitracing.com/parts/d...gaAsxEEALw_wcB
I didn't need to modify any DFCO setting. The 8K VSS requires a very ODD pulses per driveshaft revolution number. For the 1968 C10 the pulses per driveshaft revolution was about 3.25 to equal 8K pulses per mile.
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