The Cruise Control units for the ZD30 (drive-by-wire) were originally known as Auscruise before Autron.
http://www.autron.com.au/pages/Auscr...ve-by-Wire.php
I used to be an qualified CC installer years back and these were great at keeping exact speed without chasing that comes with vac controlled setups.
The units were not for DIY as it required factory loom and plug pins to be pulled and modified. Afterwards, you have a smooth controller.
,perfect for an auto to IMO 100% agree it holds it speed well