My brother in-law and I purchased similar TS5 pumps. We are constructing variable voltage power supplies and a control box. Once we are done with the project I will post pics and materials for all.
While the pump is actually rated from 3-24vdc the power supply that we are using will provide 3-20vdc which will allow us to regulate the flow. Overall, the control box will be able to run each pump with 2 amps available if the current is needed.
The only parts we are still waiting on are digital volt meters from ebay so we can monitor gallons per minute vs the voltage input.
More to come!