PN
I've just looked at my old Pilot's Notes and the dial with L/R on it is the DF Indicator and the dial on the right is the Dead Reckoning Repeater Compass. I rather suspect you're right on the modification front as I don't recall a TACAN, but I do recall a modern VOR (as I said I discovered in a drop down panel) and a DME. I wonder if it has anything to do with a Lanc not having 115v 400Hz power supply that most TACANs require?
I don't know if the old girl had an inverter fitted at some point?
LJ
