The AEM brass units are fairly cheap as well as the ProSport gauge units.

 

fyi, the FC pressure sensor is just a pressure switch. doesnt actually detect more than one specific pressure.

at idle its supposed to see a specific pressure. anything less, it goes to zero. anything more, it goes to the determined range. unless its broken, then it goes to 0 or max.

then when pressure builds, trips the switch to make the needle go to the specific spot.