Dual Fuel Tank Selector Switch Wiring Diagram - 1978 Chevy C/K Pickup

This document is a simple hand-drawn (computer-sketched) wiring diagram illustrating how to wire a dual fuel tank setup with a tank selector switch, uploaded to a 1978 Chevrolet C/K Pickup gallery. A central component (implied to be a switch or relay/selector valve module) receives a red 12 Volt feed and outputs a blue "Gauge wire" to the fuel gauge. Two brown wires run from the central component to the left tank sending unit (lower-left box) and the right tank sending unit (lower-right box), labeled "Left Tank" and "Right Tank" respectively. A green wire connects the central component to a box labeled "Tank Selector" (the dash-mounted selector switch). Each tank sender box has its own black ground lead labeled "Ground". The diagram conveys the basic wiring concept: power in, gauge signal out, separate sender wires to each tank, a selector control wire, and independent grounds at each tank. No part numbers, fuse ratings, connector pinouts, year/model applicability, or wire gauge specifications are given; wire colors shown are red (12V), blue (gauge), brown (tank senders), green (selector), and black (grounds).