How to synchronise Tempur Ergomotion Essentials King base

If you buy a King Tempur bed in Australia usually the base will come as two long singles. However naturally you would want both sides to move together as one instead of having to try synchronise the two halves manually from each side of the bed. The ErgoMotion Essential base doesn’t come by default with a sync cable and you need to request one from a Tempur or the store you purchased it from.

The cable seems to be quite generic and could likely also be purchased online.