hi all just wondering where everyone mounts there fuel pressure regulator

If I needed one it would be up high on the firewall. But why do you need one? (unless it's turbo and blow thru carb, you then would need a rising rate regulator).
If it's an N/A car, with the right fuel pump pressure to suit the carby, a regulator is just something else to go wrong.
Also some brands are notoriously inaccurate and a waste of time using.
I hear Holley ones are OK.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

What fuel pump do you use doc

I use a Facet electronic (square one) I think it's about 3 to 4psi.
Works fine with either a Weber, a Dellorto, or an SU.

I bolt them to a Mini square centre exhaust mount, then bolt that to the subframe (drill 1 hole 8mm dia). This shuts the noise up.

Note that wiring there was temporary (since weatherproofed).

Like this-

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.