Markoz wrote on Apr 2^nd, 2017 at 8:01am:

You're right. DME1 isn't displaying. Note. I actually thought mine was working correctly, until I moused over the readout, and it was displaying DME2, not DME1. I didn't realise that both NAVs were set to the same frequency! :(

There is an undocumented feature carried over and expanded upon from one of my mods...

Left mouse click on either DME display to cycle through: DME-1, DME-2 & TAT.