James, your motometer looks identical to the one that came on my 1922 Chandler Royal Dispatch. I have seen one other Dispatch (the same year as mine) with the a similar motometer (see attached).
Note that yours has a smooth round dog bone and the other looks 6 sided. I believe mine is smooth like yours. I will check. My Dispatch is a transitional model with 1921 engine and transmission and a 1922 body, Hotchkiss drive, etc.
Hope this helps.
http://www.ktsmotorsportsgarage.com/.../chandler.html