Some interesting add-on info from my experience for those who are keen to also try this setup:
Note that the more air tubing in the setup, the more combined total internal air volume there is in the system, which is a factor in determining the PSI vs pumps... as T da B mentioned, 3 pumps from the Topeak Dual G pump in his system reaches 60+ PSI, which similar to my experience with the same setups using the same amount of additional air tubing and connections too.
For those who are planning a basic layout without the pressure gauge or safety valve (and without all the associated extra tubing and connectors), the total system air volume will also be naturally less in comparison, so you will notice a difference in PSI vs pumps.
I currently have modded AT3Ks which just connect the pump tubing straight through a quick-connect check valve and then into the air tank (so the overall amount of tubing used is much less), therefore this naturally results in higher pressure with the same number of pumps. In such basic setups, i've found that with 3 full pumps using the Topeak Dual G pump, the PSI can average around 70-75 PSI instead (which is the practical limit 'cos any higher and the trigger becomes too difficult to pull).
So far, i've not found much significant difference in actual ranges between both setups though... so i guess its just a minor balance/trade-off between slightly more internal air volume vs slightly higher pressure.
Just for general reference.
