How can I use an aftermarket HU and have the option to view the engine coolant temp? I tried with a Kenwood & Connects2 without success. It's a Zafira B with CD30, and the display is 3 lines.

I have the option of returning both and going for this Chinese HU, which apparently has BC button functionality.


However I'm not sure if this will work (seller just says BC function working). I'm not too fussed with steering control stuff, just want to be able to see coolant temp.

I can use an app and code reader but that means removing the cover and running the app all the time.

Is there a way to achieve this?