DCC Fuel pump control kit

[Hammered]

Should work with any EFI system using a TPS.
It's a Pulse Width Modulator and does not lower the voltage. It basically turns the power off and on at a high frequency. At idle you have more off time.
The instructions I found don't show a fan connection. You must be looking at their fan controller.

http://www.dccontrol.com/0820.htm