I'm doing the voltmeter for ammeter swap. The 71 240Z has a yellow with red stripe and a yellow wire. I think they're yellow. May have been white at one time. May have yellowed over time. It also has a black wire. I already connected wires for the voltmeter (not in the pic). The wires in these two pics are for the fuel guage. In the other pic there are green, yellow and black wires. Does it matter how I connect the green and yellow wires to the 240Z wires? Green to yellow with red stripe or green to yellow? Any help? Thank you very much.

I don't know if this will help or not.  Different year voltmeters might have different colors.  which voltmeter are you using?