Imagine an LED that comes on when the ICE does. Install it in front of you on the dash. Just bright enough to not be distracting. Why not just look at the screen ? Well, because I like to focus on driving instead of the screen. My screen is also all clouded up and cracking inside. How hard would it be to find the wire going to the ICE that is powered on and off and splice into that with a low wattage LED ? Could that brick the car ? Also, as with everything, it's never that easy.
This is very similar to the thread you created on October 14th, 2025, https://priuschat.com/index.php?posts/3571716
Monitoring your engine RPMs via an OBD2 reader and an app on your phone will give you lots more info about your engine running or not then a light will.
Imagine an ODBII-port tachometer. As mentioned by a previous member, most of these devices supply plenty of other datapoints too.
