Thanks Brian and members
I will do as you suggest,but the black box I think must remain in service as we have a thing called Air Care we have to pass every year. It is a particulate count of the exhaust while driving at 70 kmh on a set of rollers. Afraid to upset the system.
Thanks all.

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1984 300SD turbo 126
"My true love"

God made me an atheist and who am I to question His wisdom