Speedometer cuts out/in intermittently

[Wesplace1]

05 Pete 387 - Cummins isx- zf freedom line auto trans. I have replaced the speed sensor but speedometer/odometer still cuts out. And when the speedometer isn’t working it affects the operation of the auto transmission. After replacing the sensor without results I was going to replace the transmission wiring harness but the harness is not available. Any suggestions will be greatly appreciated