Reply to "fuel sending unit wiring question"

The yellow wire is for the low fuel level warning light that was in the original Veglia gauge. Your Auto Meter gauge doesn't have that feature, so the yellow wire isn't used. The black wire & the white wire (white with black stripe) go to the sender. The black wire eventually goes to ground. The w/bk connects to the float arm. Here's a link to the wiring diagram:

http://www.panteraplace.com/page107.htm

Scroll down & click on "fuel gauge and sender".