aaaarrrrggghhhhh

Right, I have a gunson gas analyser......like this http://www.ebay.co.uk/itm/Gunsons-Digital-gastester-CO-Analyser-Austin-Healey-DB5-/320744444454?pt=UK_Diagnostic_Tools_Equipment&hash=item4aaddbd226#ht_1153wt_689 But when I connect it to the down pipe, it simply annihilates the ****** wee...