so i just put in a 350, its TPI speed density, and i have a new VSS sensor, but the speedo wont work, it did work before the swap when i had a 305 in it, and i was using the same VSS sensor, im using a 305 prom (AXXF) but i used the autoprom to make a 350 TPI chip (AUJP)

everything runs and works fine except the speedometer

anyone have any ideas

thanks in advance!

 

have to cut the yellow wire? its been so long since i did this swap
going to the vss box delete the vss box and find the correct wire for vss going into the ecm splice in and volla working speedo