Hello, today I connected vacuum meter to my car and it's not working. After connecting 12V it shows first -15, then different numbers and after 30 sec it goes off. Numbers are bright after starting and then numbers are darker and darker until they disappear. If I change RPM-s nothing changes on display.
Hello, today I connected vacuum meter to my car and it's not working. After connecting 12V it shows first -15, then different numbers and after 30 sec it goes off. Numbers are bright after starting and then numbers are darker and darker until they disappear. If I change RPM-s nothing changes on display.