ok, so I'm beginning my spring cleaning of my 1981 AC camper and when ever the door is open and the key in the ign the damned buzzer is squreeching

is it on the back of the fuse box? or under the instrument cover?  I'd love to yank this KII relay. 
will it disable any other functions?

also which vendor has a fuel line kit for the air cooled motor, I believe these are stock lines and it's 20+ years old 100K+ miles. 

I'm hoping to put a fuel pressure gauge in the crossover line, and if affordable in the High pressure line too. 
has any one done this mod or thought it out? would be nice to see at a glance a mechanical system pressure and high fuel pressure