Was working, now won't reconnect

Speeduino, Bluetooth, serial0, Data Engineers Dream, Samsung Galaxy Tab A. I had connection with default dash. Same with Engineers Dream. I made a few basic gauge changes in Engineers Dream copy. Now RD won’t connect. Bluetooth is on. No change in RD connection settings. Any suggestions?

I have the wires to the BT module soldered to the underside of the Mega, no enclosure, just testing. I’d been moving things around a lot and the TX wire came un glued. Seems OK now.