We just went to the woman who was looking after Tuna while we were gone, and out of curiosity I tried the cycle-through knob in the tachometer of our car again – and there it was, the display dimming part! How could I not see this on Saturday – I could swear it wasn’t there, but here it was! And, sure enough, after holding the button for a few seconds, the display was lit like a Christmas tree again.
I’m happy.