If you are stuck on that co because it is local and you have a 100gpd RO unit then this is what you need.
https://maxwaterflow.3dcartstores.co...es-_p_554.html
You never said how many gpd unit you have. There are other units on that page u linked to that would match your gpd ro if you do not have a 100gpd.
The units come with instructions and they will turn on and off automatically when the pressure drops/rises. You just need a 110V outlet under the sink, or wherever your ro unit is located