By Default, KSP will only show one resource gauge next to an engine icon in the staging. For normal liquid fuel engines, it only shows a liquid fuel gauge, even though the engine uses both liquid fuel and oxidizer. This mod forces both fuel gauges to show up.

Features

• liquid fuel engines show both liquid fuel and oxidizer gauges
• Jet engines show both liquid fuel and air intake gauges
• Ion Engines show both Xenon Gas and Electricity gauges
• Engines that work for the Real Fuels mods will show all the fuels that they are using.

As you can guess, this is a must have mod for Space planes that switch fuel systems, and then you run out of oxidizer or liquid fuel before the other fuel runs out.

From the original forum thread

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Super simple mod for people like me that want to see everything going on.

Most useful for Spaceplanes (tired of flaming out at full LF, just to see your out of Oxidizer) Also good for stuff like RealFuels, or engines with lots of resources