I am the author of the Air Meter Identification & Value Guide. On page 48 of the book I identify the #25. This was a wall mount, the #26 was on a pedestal (and there were three different pedestals used). There were also two different heads that were given the Model #25, one with a hook and one without.
In over 25 years of collecting air meters I have never seen a pedestal for a 26 for sale. These air meters are much more rare than a gas pump from the same year.
This is nice unit, I used to own two of them.
We are also the largest seller of ECO Model 90 parts and we offer a repair service for this model. Because there are very few service guys that used to repair them we are now doing repairs for service stations that are still using them. We have had some success in making the 25/26 units work, but we cannot guarantee we can repair every unit because of the lack of parts.
To see the stuff I have for the 25/26(a service manual, parts sheets, ads) see my website:
www.petrocollect.comJack Sim