2003 Mack cl problems

2003 cl 713

Picked the truck up from the shop, they fixed some wiring and lighting issues, and repaired some wiring on the trans for the reverse lights…

The Speedometer just decided that it wanted to stop working on the drive home , I’m assuming that’s a sensor hopefully something simple.
the next issue is truck feels like it’s not building boost. Can have the pedal all the way to the floor and the truck just don’t pull.
So started looking into it and seems like it could be the speed sensor, I’m wondering if they damaged it when they were repairing the wiring. I’ve called the shop but haven’t heard back.