Run a Lithium battery? Try to get the most out of your battery? Is your ZRX over ten years old?
You need this neat little voltmeter. Fits in a 1-1/8″ hole. You can cut the dash with a stepped drill bit, or a Dremel, of an X-Acto knife.
I mounted mine like in the pictures and it is in my direct line of sight. It is not too bright at night, and unless the sun is at your back and up high, you can read it most of the time.
A “normal” ZRX puts out 15.1-15.3 volts when riding.
This voltmeter is waterproof and I’ve been running mine for way over five years now.
Comes with two spade connectors. I wire them into the marker light wire on most bikes.