this is mechanical counter which counts by one circular movement on side wheel and shows counting upto 999 to make this u need to 3d print out the parts and label them this was firstly made centuries ago with wood but this is the plastic and durable version of it
Step 1: Materials
u need not to 3d print out the counting display but can take out that from the old odometer display and some some other parts also from the old odometer
Step 2: Assembling
from the odometer u would get almost 70% of counter pre assembled u need only adding spring to reset and add according to needs by seeing in the picture
Step 3: And Here We Go!
here is link to watch video similar to this of working please enjot