Also keep in mind that race cars do NOT have a speedometer (unless it’s showroom stock or a derivative). THAT particular F1 car might have been set up to display speed in the cockpit, but likely the speed was displayed back in the paddock, not IN the car. The Tach and oil pressure are your most important gauges, and you check those when you’re not busy, like AFTER you have completed your turn exit and have a bit of straightaway in front of you..
What you need to know when going REALLY fast comes to you through your eyes, ears, feet and butt. The tach and oil pressure gauge help keep you from breaking things.
Telemetry or an old fashioned stop; watch timing the circuit. sd