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Most sanctioning bodies require isolators on mechanical fuel pressure gauges to keep fuel out of the driver's compartment. This Gauge Isolator Kit from Auto Meter allows the use of an in-dash mechanical pressure gauge while keeping fuel (or other dangerous fluids) away from the driver.
Simply mount the isolator unit in the engine compartment and connect it to the engine. Run the included 4 foot 4AN hose to your pressure gauge and fill the hose and your gauge with an antifreeze solution. The inert solution safety transmits pressure from the isolator to the gauge. The dangerous fluid stays in the engine bay where it belongs.
This kit is designed for Auto Meter pressure gauges, but it will work with most gauges that can be adapted to accept a 4AN fitting (some gauges have an internal restrictor, which must be drilled out). Working pressure is 200 psi, with a 300psi maximum peak. It is great for fuel pressure, oil pressure, or any other fluid you don't want in the cockpit. Compatible with gasoline, oil, and antifreeze. Not for use with alcohol or nitromethane.