As far as nitrous is concerned whats the point in having a engine mounted fuel pressure gauge??? wouldnt it be more useful in the cockpit??? THanks

 

My gauge is underhood because the only time I need to see it is when I set my fuel pressure.

 

Like said above, you don't really need to monitor it constantly.

Also, mechanical fuel gauges are more accurate than electric gauges, and running mechanical fuel gauges in the cockpit is either illegal or requires complex isolators that may skew the readings.