Cindy and I have been selling ECO pars since 1989, also I am the author of the Air Meter ID book. Before you do anything to the meter I suggest you get a copy of the Service Manual that I rewrote. The original manuals are hard to follow plus my manual is written with "Jack's Tips" to help you with the things that are not covered in the factory manual.
Email me with your address and I'll send you a copy: firstname.lastname@example.org
New gas pump ID book available at: www.gaspumpbible.com