My ultragauge used to go off when turning the key off at stop, but now it stays on.
Changes I've made include some of the following, from
the latest ultragauge manual.
p44, read about pwr on detect, change it from 2 to 0;
p46, read about pwr off retries, maybe use if applicable;
p46, read KPW/9141 if applicable ~ my setting is 37;
p47, force mpg sensor, I'm using the MAP sensor on mine;
p47, injector cutoff, read and use if applicable.