Loose kitchen faucet

This was never super tight on account of that brass looking piece not fitting behind the porcelain. But now it’s loose af. There is a nut hidden hidden by the water lines. How in the hell am I supposed to tighten that sum bitch? I’ve got no room for a wrench (can barely get it finger tight). Thanks!

This was never super tight on account of that brass looking piece not fitting behind the porcelain. But now it’s loose af. There is a nut hidden hidden by the water lines. How in the hell am I supposed to tighten that sum bitch? I’ve got no room for a wrench (can barely get it finger tight). Thanks!