Air Filter Minder?
 

I really would love to put an air filter cleaner indicator on my Jeep due to its really small surface filter size. I like to change with the slightest hint of dirt accumulation, knowing air is key.

I found one im my drawers- but this one is from a huge caterpillar v12 twin turbo engine. Does size matters here? Or do they all have the same vaccum trigger level?