Just sharing. I fixed the OBU but DID NOT opt for the display unit.
I paired two APPS with the OBU. Breeze navigation app and ERP 2.0
Pairing - a bit self for me cos after registering the handphone with LTA, I couldn’t pair my phone with the APPS. Finally I looked at the FAQ.
Must wait 45 minutes after registering with LTA then can pair
So it’s paired
BREEZE APP
I realise I can’t make the map dark so it’s not so useful. The app itself is useful when you are planning a trip and want to avoid ERP but that’s about it. Only additional info is the Cashcard value
ERP 2.0
I tried it. But it only shows a clock and the cashcard value. It will notify you if you are approaching a school zone, silver zone but I think it’s distracting. So I don’t use it now.
What I do is now log my Breeze app to the OBU before I start the car just to see the cashcard value then go straight to Apple Maps

. Yea, Apple Maps won’t show cashcard value but unless you are going through many erp gantries, you don’t need to see it real time. At most, before you park the car, just switch from Apple map to Breeze on the head unit to get the latest Cashcard value
With the head unit and app, you can’t deactivate the cash card but it’s easy to just reach over and pull out the card. You don’t need to pull it out all the way anyway so no issue putting it back in after crossing a parking gantry
Took about 4 hours to fix cos apparently the workers stopped for a while for lunch first