Proposal to amend para. 9.3.2.7. to specify that air to fuel measurement equipment shall be a wide range air to fuel ratio sensor or lambda sensor of Zirconia type mounted directly on the exhaust pipe where exhaust gas temperature is high enough to eliminate water condensation, with sensor accuracy within 3 per cent of reading for less than 2, 5 per cent of reading for 2 to less than 5, and 10 per cent of reading for 5 or greater, calibrated as specified by the instrument manufacturer.