I have a 2001 Isuzu NPR diesel and tyhe fuel gauge is not I have a 2001 Isuzu NPR diesel and tyhe fuel gauge is not working properly. When I fill the tank up the guage barely - Answered by a verified Technician Isuzu Npr Fuel Gauge Wiring Diagram - Electrical Schematic Isuzu Npr Fuel Gauge Wiring Diagram - Disclaimer: We don’t host ANY of these image files. We never store the image file in our host. We just links to many other sites out there. If you need to remove any file, please contact original image uploader.