I've got a 95 civic vx hatch that the stock fuel gauge doesnt work in due to the needle being broken, I bought an aftermarket autometer fuel gauge and was wondering where I would need to hook up the sender wire, on the sending unit in the tank or in the gauge cluster??

 

Is it an air/fuel gauge, fuel pressure gauge or a fuel level gauge?
Google - About 291 results http://www.google.com/search?q=civic...1f3adc9cfc4964

 

they make fuel gauges there should be a float in the tank you will need to tap into im sure or the fuel gauge may come with something....

 

its a fuel level gauge

 

Okay. Check the link I gave you. 291 related threads on HT alone.

You might want to pay particular attention to this one. It's also not as simple as splicing into a wire. There are resistance values to take into account.
https://honda-tech.com/forums/tech-misc-15/autometer-fuel-level-gauge-wiring-issue-1833994/

 

It will probably be easier to replace the entire cluster unit, instead of adding an aftermarket unit.