Turbo Boost Indicators

With ignition switch in "RUN", "BULB TEST", or "START" positions, current flows through the "GAGES" fuse, to turbo power indicators, and turbo boost indicator switch to ground. At an intake manifold pressure of 2.5-10 in. Hg, the low boost switch closes. The Yellow indicator light comes on. Above 10 in. Hg, the high boost switch closes. The Orange indicator light comes on.