Much of the actual mechanic is at [Madness].

You can put a pretty table of your sanity stats into your character sheet like this:

<table>
<tr><th>Failed</th><th>Gauge</th><th>Hardened</th></tr>
<dtml-var "madness_meter('Unnatural', 2, 5, 'table')">
<dtml-var "madness_meter('Self', 0, 0, 'table')">
</table>

Or put it inline like this: <dtml-var "madness_meter('Violence', 3, 7)">.

You need DTML turned on in that WikiPage for this to work.