I coughed up for a $500+ system with internal sensors about ten years ago now, after three years the batteries in the sensors started failing and as they aren't replaceable new sensors are required at about $80 each at the time. Despite being promoted by most in the 4wd movement NO spares were available and not long after the company went out of business.
As we were about to depart on an extended trip I bought a $45 solar powered unit on ebay with four external sensors and although they are all now well over 5 or 6 years old and the batteries have been easily replaced a few times they all still work well. On that frst trip they wobbled on the rubber stems and marked all the rims but that was cured by cutting short lengths of black foam pipe insulation from bunnings and fitting them between the sensors and rim.
Roll on to the present and they are now fitted to the new Method rims on the Oka with metal T double stems which work well as the sensor is placed back towards the wheel out of harms way and the other sid eis used to inflate and deflate as required.Methods with T valve (Medium).jpg


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