borednow:
Thank you, I did eventually find the info that they should be behind that panel, next plan to swap leads over to check if its the sensor, fortunately dont have any jobs for it that cant wait a few days! Interesting that the cheaper pattern part may be more reliable.
Yes, swap the plugs to the sensors over, and see if the fault goes to the other gauge. If it does, replace the sensor, if it doesn’t its probably a gauge fault on the dash, but these can be sent away and repaired quite successfully, no need for a new dashboard unless you like big bills. I am normally a big advocate of genuine parts for reliability warranty and backup, but as said previously Volvo have had issues with their sensors and the non genuine ones last better than the genuine.
As for the lift axle, is the amber light for the axle flashing on the dash, showing steady or not on at all? Not wanting to tell you how to ■■■■ eggs, but the switch is toggled UP for axle up, and in the central position for normal running. It will only drop automatically when the drive axle approaches fully laden, but beware as this could mean the front axles are overloaded. So laded put it in the central position. The bottom sprung position is to dump the air from the lift axle suspension bags, but not lift the axle up. This transfers some weight onto the drive to aid traction but the lift axle stays down. The light on the dash shows a steady amber light.
Hope this helps