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It's a good start. You can buy an O2 sensor and a gauge and mount it in any vehicle. It takes a bit of work to install it if you don't have a bung already welded in your exhaust, but it will show your air/fuel ratio in real-time. Just make sure the gauge and the sensor operate on the same voltage system (0v is rich, 1v is lean, etc.) like you would do with a fuel gauge.
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