Overdrive speedometer cable extension

Sorry for kick starting an older thread.
68 Dart- RH42 out of a Dakota
I grabbed the long cable when I got the transmission, but theres an interface with electrical connector (cruise control?).
The floor pan interferes with this. Does anybody know of a shorty adapter that allows the cable to go straight to the transmission?
Is this 5/8 on the cable end and 7/8 on the transmission end?

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