Does a tach need a remote wire?

will a tach drain a battery if it doesnt have a remote wire mine only has four wires to it: light, tach, power, ground

i'm not sure but i'm pretty sure the power wire is supposed to be hooked up to a switched wire, such as the ignition or accessory. personally, i would hook it up to the ingnition wire under the dash. but don't take my word for it, i've never installed one before. hope this helps. good luck.

will a tach drain a battery if it doesnt have a remote wire mine only has four wires to it: light, tach, power, ground
It wont drain the battery if it's hooked up right, I've never seen a tach with more than 4 wires, the "tach" wire is like a remote. It's only activated when the engine is running, well besides the light if you happen to leave your lights on. That will drain your battery no matter what.