1999 Peterbilt 379 2ws cat Tac and Speedo not working

Hey I have a Peterbilt with the Tac and Speedo not working 2ws cat . I tested the gauges they are getting power . I am confused on the Tac gauge is it ran off the cam or crank sensor? Also is there a reason why both would not work? I just bought the truck . I saw that the crankshaft sensor wasn’t connected to anything and I saw two random wires hanging close by from the engine harness so I tried using those wires but nothing . I tested those wires no power on them .

 

Flywheel sensor (crank) not connected to anything two wires come down from the wiring harnesses close to it but doesnt have power on them when tested with test light .12 o clock sensor is connected but 7 o clock is not connected to anything . Yes cruise control works .

 

Even with the flywheel sensor not connected to anything? And the 7o clock sensor on tail end of transmission not connected to anything?

 

The digital odometer comes on

 

Only ones not working is Tac , Speedo and engine oil temp .. but I do have two random wires hanging down from the engine harness with no connections and the crank sensor not connected to anything