How many increments will the gauge read for a 6" sending unit? Every 1/8 tank (9 positions)? Or only 5?

It is kind of more of a fluid movement of the gauge because of the Rio stat so it will register appropriately as the fuel goes down. It does not just move one quarter to 1/4

Gauge goes to full then back to empty in just a few seconds

Couple things 1. Check your ground for bad connection 2. Check power positive side also Check connection to battery

Can the sensor be mounted to the bottom of a fuel tank and then reverse the ground and sensor wire?

I dought reversing the ground at the sending unit will reverse things. But it might? The gauge is calibratable. There are instruction that will explain how to calibrate gauge. You could wire up the gauge and sending unit on your bench and test everything before installing it in the tank.

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Description

⛽ Stay Ahead of the Tank – Fuel Smarter, Not Harder!

PLUG PLAY INSTALLATION - Designed with SAE 5-hole mounting and quick wiring terminals for a hassle-free, fast setup.
READ YOUR FUEL LIKE A PRO - 8 customizable backlight colors and anti-fog curved glass ensure crystal-clear fuel level visibility anytime.
PRECISION MEETS DURABILITY - Crafted with stainless steel and high-quality reed switches for long-lasting, rust-free performance.
BUILT TO BRAVE THE ELEMENTS - IP67 waterproof rating and high oil resistance keep your fuel sender reliable in any environment.
UNIVERSAL FIT FOR EVERY RIDE - Multiple sizes available to perfectly fit boats, trucks, RVs, and industrial vehicles.

The Rupse Fuel Sender Unit is a high-precision, stainless steel fuel level sensor designed for universal fit across boats, trucks, RVs, and industrial vehicles. Featuring corrosion resistance, 8 backlight color options, IP67 waterproofing, and easy SAE-standard installation, it delivers accurate, reliable fuel readings with a sleek, durable design built to withstand harsh conditions.

Specifications

Brand	RUPSE
Fit Type	Universal Fit
Vehicle Service Type	Truck
Item dimensions L x W x H	13 x 2 x 2 inches
Material	Stainless Steel
Specification Met	SAE
Auto Part Position	Outside
Hose Length	13 Inches
Outlet Connection Size	6 Inches
Inlet Connection Size	13 Inches
Outlet Connection Type	Threaded
Body Material	Stainless Steel
Inlet Connection Type	Threaded
Connector Type	screws
Gas Type	diesel,gasoline,methanol
Mounting Type	Flange Mount
Operation Mode	Automatic
Product Grade	Performance Part
Automotive Fit Type	Universal Fit
OEM Part Number	CE30GAU001
Manufacturer	Rupse
UPC	192032001428
Model	Fuel Sender Unit
Item Weight	13.4 ounces
Product Dimensions	13 x 2 x 2 inches
Item model number	03CE30GMAU001
Exterior	抛光
Manufacturer Part Number	CE30GAU001