Personally I would just check the spray patterns off the engine. The nitrous would safely dissipate if you give it time, but the fuel could wash some lube off the cylinder walls and make it into the crankcase. Be sure to bolt the plate to a manifold before testing the nitrous side, put 950psi to the bar and that plate can get pretty wild if it isn't bolted down :)
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I use "Dean's Ultra Plugs" pretty much everywhere in my nitrous systems, commonly used for power connections on radio controlled cars/planes. Very small and vibration resistant, able to handle 60a continuous. Makes it easy to disconnect/test solenoids or switches, also makes it easy to tap in between the connectors to add switches or data connections later. They only make the one style ultra plug, so I color code my connections with colored ti-straps to make sure everything gets plugged back in correctly when I take things apart. Hobby shops also have some really fine silicone covered "spaghetti wire" that's super flexible (expensive too), I use it on everything that's attached to the engine.
Grant
