I have one of these on my pointy.
http://www.tyre-track.net/products
For £99 its amazing value.
It is located above my clocks and looks quite at home there, ill have to take some pics.
Few advantages:
1. Identifies a puncture as it happens allowing you to stop before you either.
1.a) ruin the tyre by running it flat
1.b) lose the ability to control the bike
2. Tyre temperature
2.a) Confidence in trusting your tyres are heated enough to provide mega grip.
2.b) if the front or rear are very far apart temperature wise.. Bearing failure or binding calipers.
3. Tyre pressure
3.a) Means you don't have to check them when hot/cold etc
3.b) bike feels funny for a second? Do i have a flat? Instant confidence rebuilder.
4. Battery indicator + voltage gauge, handy.
As mentioned, you'll be surprised at the Psi difference between hot and cold.
One of my best purchases..!