94 K1500 with 454 swap, Holley sniper EFI and hyperspark distributor, original 4l60e rebuilt 200 miles ago, truck runs but not shifting in drive, stays in 3rd gear. Plugged obd 1 in and it says park/neutral when shifting. Speedometer works so getting speed sensor data. Checked power and ground but can't understand how the trans gets rpm data. The sniper doesn't have a trans adapter but trying to figure out a way for the trans to see rpm and shift correctly.