It seems Morgan understood there was an issue and were starting to add PCB protection, if not a fix
Nice find Dave, what a bargain
If my memory serves me correctly this was a supplementary loom that appeared on some cars and carried additional fuses for the O/S and N/S indicator lamps. I believe their function was to protected the PCB's fragile tracks from the full 15A/20A supply when there was a fail/short/water ingress in the indicator lamps. Certainly a nice to have extra but they have caught people out when they have blown in the past as there is no circuit diagram reference to them tucked away behind the dash.
In principle it would be a simple mod to add a couple of fuses to the wires entering the 12 pin PCB connector, wires GR90 and GW86.
Not sure if these fuses would address any of the other PCB shortfalls such as the the suspected back EMF or spikes from the blower motor taking out certain components, for one.. .
Thanks Rog, at least I know where to look if the inductors fail
For now though, everything is back working, so for £200 with a spare set of gauges thrown in for free, that'll do me for now