i have a 95 rx7. I'm trying to install an auto meter gas gauge. Does anyone know which wire coming out of the factory fuel tank harness is for the sending unit?

 

Off hand no but you'll find it in the wiring diagrams:

Foxed.ca - Mazda RX-7 Manuals

However it doesn't matter because your AutoMeter gauge can't use the stock sender.

 

+1 for that, why do you want to change it btw? Just curious.

 

Why can't I use the stock sender? And I'm changing it because every Mazda gauge, wire, and parts have been ripped out. I'm running a ls1 and I wired everything myself. I still have the stock harness running into the fuel tank in hopes to tap into the stock sending unit

 

I just spoke with autometer. The factory sending unit will work just fine. So back to my original question. Anyone know the wire color for the sending unit

 

Did you ever find which wire this was?