Morning Jim,
this is how I have mine.
< click pic for larger view
You can put a 'T' in there and plumb the mechanical gauge and still have the electrical for whatever reason.
A home built gauge pod for my mechanicals ..
< click pic for larger view
And no, I'm not happy with the placement of the tach :wink:
And if your curious this is where I put my fuel pressure regulator:
< click pic for larger view
It's above the vapor canister on the firewall. I have a pre-filter coming out of the tank to the fuel pump and another 40 micron between the pump and FPR