I wasn't going to do anything to this weekend as I have a house inspection during the week, but making a mess in the garage was more fun than cleaning.
So, under the pretense of getting some mower fuel I some how ended up at Jaycar and bought a relay and some connectors.
Back home I cut the cable and did a nasty job of splicing in the relay with another on/off switch that would be easier to access. It all worked, but the earth I had placed onto the case wasn't reliable, so I had the brilliant idea to open the case and splice into an earth there.
Well, what do you know!
Apart from the factory soldering job that looks like it was done a hot brick, inside there is a relay!
The factory on/off switch looks like it wasn't up to the amperage, so they used they to switch a relay. That made everything so much easier, all I had to do was run a wire from the relay to the pressure switch and from there back to the existing On/Off switch.
Simple... except that I'd hacked some out of the existing cable, so I shortened it 6" and soldered it back in. One day I'll add a longer cable as now it is just long enough to make it from the battery to the ground. I did find that I can also turn the end cover 90 degrees so I don't have to get my fingers past the hot air fittings to get to the On/Off switch.
So, from atmospheric to 110psi takes around 12 seconds, after 30 seconds it still hadn't bled down to 90, so I don't think a non return valve is required for my application, but I have a plan to re purpose the valve I binned from the extinguisher. Hopefully the bin hasn't been emptied.
https://www.youtube.com/embed/mhqCe6IqGKA