From the Update Kit Instructions:
There is a breakout connector to bypass the main instrument connector - it appears that was identified as a failure point
The short version
- Disconnect the Purple, the Red and Red/Orange Wires from the Instrument side of the Instrument connector
- Disconnect the Purple, the Red and Red/Orange Wires from the Main Harness side of the Instrument connector
- Use a suitable (sealed) 3-way connector set to interconnect these separately from the OEM connector.
As you can see from my schematic above, the Purple is the Constant Power; the Red is the Tach signal and the Red/Orange is the Speed Signal)
Because of the trip memory going out, the only one of these that could cause this is the Purple Wire.
So begin by just inspecting the terminals of the connector set, particularly that for the Purple Wires
(Honestly, if you don't see any damage on the terminals I would doubt if you would gain much by changing the connectors - take a good look at them though!)
Here are the actual Triumph instructions for the bypass connector set: