A gauge would only be good for the visual representation of pressure or the lack of.
You can have pressure but no flow at the injection point....................what is needed, is to know if theres no flow, low flow, correct flow and high flow. You need/want this tied into you boost control or EMS so that the system can take corrective action electronically, as well as have a visual input to the system function state.
No flow could me no fluid in the supply tank or a line popped off prior to the flow sensor. Low flow could mean a partially clogged jet, filter or a kinked line. Correct flow is whats expected to be there via proper calibration for the jet being used. High flow for instance is for when a line pops off after the flow sensor.
As for the failsafe, If the engine can run safely without the methanol injection system then you do not need a failsafe.
If the engine is tuned for water/methanol being injected, and the tune is dependent on the methanol being injected, then it would be foolish to risk engine damage by not having a proper failsafe. When tuned for methanol injection a proper failsafe could be considered like an insurance policy.
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