Thanks LVR

I know the offset on three wheels was zero but the one that was causing the issue was varying between -3 and 1.

I have ordered the INPA software to see if this helps better than the snap on unit a friend has, I did check the wiring but could not see any damage to it but understand it could be the plug.

I replaced the valve unit because the front left was showing open that’s now good,
I replaced the compressor head and seal because I was only getting 11 bar, now I get 16 bar so that’s good.
I replaced the sensors and rods because I thought the sensors may be faulty due to the regulator rods being stiff.

With the voltage I think they were similar, around 2.5 v but will check when I get the software and let you know how I get on

Regards
Mad Welshman