The Stewart Model 160 is correct for your car as shown in the photo, but other brands were available in 1926. It will make a difference if your car has wood wheels or wire wheels. I hope this helps, Russ Furstnow
The speedometer head you have is incomplete and is made by Standard Thermometer Company. I would suggest you get a Stewart unit, as these are the most common. PM me and I'll get you more information. Russ Furstnow