Yor profile says 90 laser, you sig has a 2g pic...which car are you installing the gauge in?

Here is a picture of the fuel pressure solenoid on a 2G (green arrow):
http://members.shaw.ca/dsm.1000q/Engineprimer/2G/solenoids.htm

Here is the 1g (green dot):
http://members.shaw.ca/dsm.1000q/Engineprimer/1G/solenoids.htm

And if you're still confused, just follow the hoses and see which one goes to your intake manifold.

if its a 1G its the black hose with blue line...

My 2g (GS) is my spring,summer,fall car and the laser is a project car