1991 FLD120 odometer is not working wires cut

Hi guys I am new to trucking I had been only 2 weeks behind the wheel and I found out that behind my speedometer and tach PO cut so many wires no wonder I have some issues like odometer is not working maybe? Or is it something else? I don’t have diagrams and I am new to semis so I am calling for some help to get it working also the trip meter is also not moving.
Any help will be really appreciated! tank you guys in advacnce

 

Here are a couple of pics

 

Yes Speedometer is working and the odometer is on the speedometer by the way the speedometer is of like 20 km when I compare it with the phone speedometer

 

Here is a pic

 

Actually it moved from 493411 to 493505 over the course of more than 600 km and stayed in there and I haven’t seen it going up anymore.

 

ok thanks for the info, the odometer 2 weeks ago I reset it to zero and moved 23 km and also didn’t move anymore.
Where can I get a service diagram for wiring so I can start to redo all those cut wires?

 

I will have to check that sensor, is it electric right?