I suppose that withe the manual switch (given that its on and off, not on when held down and off when released) you will be able to switch it off completely. Otherwise, get a three position switch, one for manual, one for auto and an off.

Have this running in my car using the wagon bottle under the bonnet, existing wires as the loom is the same between wagon and sedan and just two wires running from the hobbs to the switch. Works a treat. At 8psi, you get two weeks from it.

I think there is a link with a wiring diagram, follow that and it's piss easy. just t-piece it off.

Water spray lovin.

One question, are you running front mount? if so you may find that it will leak constantly.

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