How should the vacuum gauge be positioned in a vehicle?

The vacuum gauge should be positioned so that it is visible and legible at all times for several important reasons. Having the gauge in a readily visible location allows the driver to continuously monitor the vehicle's system performance, which is crucial for safety and efficiency. This visibility helps in identifying any issues in real-time, such as changes in engine performance that could indicate a malfunction. The driver can react promptly to any adverse readings, facilitating timely interventions.

Positioning the gauge out of the driver's line of sight, only on the dashboard, or under the driver's seat would hinder the driver's ability to monitor it effectively, potentially leading to complacency or delayed reactions to critical performance indicators. Therefore, ensuring that the vacuum gauge is always visible and legible enhances the overall operational safety of the vehicle.