mga magkano po ba magagastos kung papakabit ng voltmeter sa auto?

saw this thread kc sa isang forum ---

Voltmeter Install

Alternator failure is the common denominator among car owners, it strikes suddenly and leaves you wondering how to get home. Cold and rainy weather also does funny things to the car sometimes. It happened to me as the car simply died in the middle of the road when I let of the throttle. Prior to that, the radio was already crackling on and off and the lights were dimming. Well now with a voltmeter I can precisely monitor my electrical system's health, normal voltage would be 13.8- 14.0 volts, if that ever drops to 11.5, something is definitely wrong.
1.
Remove the seats because its a lot easier to remove them than to work around them. Remove the center console.
2.
I've cut out the cigarette lighter, it has four wires, 2 are for the orange kight ring aournd it and the other 2 are for the actual lighter.
3.
I got an Autogauge Voltmeter, Its made in Taiwan but looks good, it works and has a warning light if ever voltage drops below 11.5v.

thanks