Found the first issue.. only had it for a few days. So my temp gauge always reads low, ie only a mm or so from the bottom. Heater is working fine and pretty quick so thermastat appears to be functioning, and no (overheating smell) having raced cars that do overheat easy, very familiar with that smell!
So, pretty sure either the sensor as crapped itself, or an issue at the dash end. Installing an engine watchdog.. as I intend on towing with it eventually having an audible temp alarm is always a good thing.
So next Saturday.. the install list....
Engine watchdog
Standalone bluetooth kit
Aux input to factory Head Unit
Replace the factory sub with a pair of 10"s
Thankfully I have a good mate who is helping out who runs his own car audio business, and has helped me with all sorts of stuff from looms for aftermarket ECU's, building boost controllers.
Will be very interesting to have a look at the temps it is running at.