Review on Qiilu Digital Battery Indicator BI003 12 by Brian Rogel

I had a previous meter that looked like this and connected the same way. This sensor was hooked up the same way and turned on with flashing red bars even with the ignition off. The info says it works on 36 volts, but the sensor is labeled for 12-36 volts. If you are looking for a pressure gauge for your car I would look elsewhere.