Emissions not tested.

I regularly test diesels ( as most of us do ) & always ensure engine speed is recorded by the pick up linked to the analyser . That way a zero emission reading from the tailpipe generates a response from the analyser & creates a 0.0 print out . It also DVSA you are using your equipement to its fullest capability , when they review your saved emissions sheets . It also speeds up emission testing as you fast pass rather than attempting numerous attempts to get a reading .The rev pick up is already working as I have checked oil temp is 80C or higher .