It would be possible
The keys involve
1) splicing new connector to the OEM harness to mate with the digital cluster
(you can use a connector from a GSXR or similar headlight harness)
2) Installing a speed sender from 99-04 Sprint and wiring to the connector
3) custom circuit to drive the low fuel light (I have done this)
4) Validate/scale the temp signal as required.
And of course knowing how to do that!
Another alternative is to install a Sprint ST speedo in the tri-cluster and drive it with a Sprint Speed Sender. That will retain the OEM look but give you an electronic speedo.
http://www.triumphrat.net/speed-trip...ml#post1332132
.