Where does a 98 f150 that was originally equipped with a 4.6/4r70w receive its speedo signal from?

The truck now has a 02 supercharged harley 5.4 and 4r100 in it. I had to swap to a N/A 98 5.4 engine harness and fuse box harness along with a N/A 5.4 ecm to get the truck to run and shift through all the gears. Now Im trying to figure out what it will take to get the speedo to work.

Thanks for any info

 

Originally it pulled it from a vss gear near the back of the transmission, but they stopped using that for the 99+.