If you look at Chapter 28 page 13 of the July 15, 1992 AA5 Series and AG-5B Illustrated Parts Catalog ( Photo Attached) you will see listed attachment parts for mounting the fuel pressure transducer onto the firewall.

My AG-5B fuel pressure transducer failed with around 600 hours on it and the Tiger factory personnel moved the mounting from the carburetor to the firewall because their experience is that the transducer will fail from vibration when mounted on the carburetor but they never fail when mounted on the firewall.

I encourage you to have it mounted on the firewall. I have included an attachment with 2 pictures of the installation on my Tiger for you to see how it was done.