wiring guru's needed

[-T-]

I am putting an 01 blazer tank under the bed of my truck. I have the fuel pump wired and functioning, and now im preparing for an aftermarket fuel level gauge. I have found the wiring diagrams for the fuel pump. My question for the GURU's is, does the fuel level sensor return wire just get ground? Does the computer ground this wire or can I just ground this wire to the frame? My understanding of the wiring in the donor vehicle is that the computer grounds this wire when the blazer was running to keep the dash completely shut down when turned off. Im not sure that I would have to have this as it doesn't draw enough power to matter, or does it?

http://www.justanswer.com/uploads/rm...91804_fule.gif

thanks