90 Mustang GT speedo cable issue

I just acquired a 90 mustang gt in a trade. Car is a auto and has supposibly a c6 trans swap in it. Heard this wasn't a good swap, but regardless went to change out heater core realized there was no speedo cable attached to speedo. From research I have done looks like there is no way I can just hookup a speedo cable is this correct? Car is on a megasquirt so was thinking of going there digital dash but if I can do it way cheaper would prefer.
 
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Pretty sure the C4 and C6 will accept the VSS out of your T5 or AOD. If the C6 is so wide that there is not enough room for the stock VSS and stock Speedo cable then you might need a 90 deg adapter.

I believe the VSS goes into the C4 and C6 about in the same location on the AOD or T5 so roll under the car and check the driver side of the trans tail shaft housing.