On early LaGG-3 it is a red light on right of panel. See the Aircraft Guide.pdf in the main il-2 folder. This guide is more useful now since it has recommended combat and cruise RPM settings for many aircraft. LaGG-3 series 4 for example:
Quote:
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Combat Engine Setting: 2,750 RPM Best Cruise: 2,300 RPM Economy Cruise: 2,100 RPM
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