Another tip. Once you have trackir working diddle with the FOV setting since you have a good view of the instrument panel. On the P-38 as an example, the FOV auto setting is 106 on my machine but I get a clearer view of the gauges using 102. It slides up a little closer to a proper head position to the front screen. It just looks more real. You might have to alter your head position while adjusting the FOV as well.
On the other hand I did not find it useful to alter the FOV on the P-47 bubble tops. The point is not all plane will benefit from a FOV change but it is interesting to change the setting.