I think in the long run, it won't matter how you initially "train" the TCM. Here's why: The training is continual, and it is a weighted average kind of adaptive training. What that means is that it is continually looking at the driving habits and puts heavy emphasis on the more recent inputs, with the earlier influences eventually fading to having zero effect. I don't know what the latency of the earlier influences are, i.e., does it take two days or three weeks for inputs to fade to insignificance?
If someone knows different, speak up - but this is how things of this nature would typically be done in the engineering world.
'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs