Pisca,
Yes, "bridging the safety circuit" means bypass at the fuel pump relay, refer to the Bentley, there's a pic. The fuel pump needs to be running for the cold/warm pressure tests. Use a fuse in the bypass just in case and when you're done, keep it in your glove box.
Sorry, can't find a good pic...
By the way, this thread has some great info
CIS Troubleshooting for Dummies
... and if you don't have the Bentley, get one. Mine is used to shreds.