gas guage

I have a 1981 Datsun/Nissan 720 pick-up truck with 200k+ miles, and a Z22 motor. I am redoing the whole interior, and all guages. I need to know what kind of gas guage I need to get. I went to my local parts store and they have three types; one for GM, one for Ford, and one for AMC. Just wondering which one will work for my application.

Thanks,
David from Alabama