I replaced my stock tank and added a fuel cell in my trunk. I am currently using a GM sending unit with a Auto Meter GM fuel gauge. I hate it!! I want to use my stock gauge. Ive called many places and no one can help. I have even called a place that specializes in building custom sending units. Im not good with a meter so I can not trouble shoot this.

 

Your going to have to take your fuel cell sender resistance (ohms) readings and make them similar to the stock sender resistance readings (ohms) and then wire it up to the stock wires.
Doesn't sound to bad for someone with electrical knowledge to do.
Why do you have a fuel cell? Race car?

 

ive been told to that I just have to get an ohm meter and race car.... daily driver and track car lol Once I pay it off then yes it will be my race car and get something cheap on gas!!

 

post this in the racing area as surely someone there has dealt with this, but I think the info may be listed in the service manual, might be complicated by the fact that the OE saddle tank has two senders, one for each side

 

Wow fuel cell is a pretty big step for the first stages in my opinion. What year is your RX-8? And can you give me a link to your Autometer gauge specs?

 

It's an 04. It's not really the first steps I have other things done to it I have a full turbo kit with methanol injection just don't have it on yet. I don't have a link to gauge specs but it is a 0-90ohm sending unit