“Dropped idle temps more than 15 degrees and was able to overclock the pi to 2 ghz using this with no problems. Works great in conjunction with the Pibow Coupe 4. Highly recommended!”
Ahoy! There's a detailed tutorial here: https://learn.pimoroni.com/tutorial/sandyj/getting-started-with-fan-shim , drop us a line at support@pimoroni.com if you need any more help :)