My Autometer fuel gage reads backwards

[chevelleven]

Hi, I have a new Autometer 2 1/16 Street Rod Artic White fuel gage installed in my 71 Chevelle. I kept the original tank sender unit. I connected "S" to sender (Tan wire), "I" to + from ignition and "GND" to ground. Now the fact is that when the tank is full, the pointer reads a little bit over "1/2", and while the fuel is being consumed and the tank level goes lower, the pointer moves gradually toward "F" until it reaches the gage top and can´t keep moving further (So, it is reading backwards).

I´ve checked the wiring, connections, grounding, etc., and still can´t fix the problem.

Can the tank sender unit and floater be installed backwards? When I installed the mine, I think it had only one possible position to be attached.

The original gage (Non SS) reads "F" at top and "E" at bottom, so the pointer travels clockwise from F to E. The Autometer gage pointer travels from right F to left E (Counterclockwise), Could this be the problem?

Thanks for the help!

[chevelleven]

Well, seems I´m on my own with this: I asked Autometer about the problem, and they asked me to check the product number. Checking it, I realized that I have the incorrect gage: 240E-33F ohms which matches with the universal fuel sender that came with my 1300 Street Rod Artic White Kit.

Now I see clearly why the gage works backwards: In this product, the more resistance, the more the pointer goes towards E, so, when the GM sender floater (0-90 ohms) rises and increases resistance, this gage reads towards E.

I have two options: Adapt the universal sender to my fuel tank, or replace the gage with the correct one.

Thanks anyway to all those who read the thread, which I hope becomes useful!

[XcYZ]

Originally Posted by chevelleven

Thanks anyway to all those who read the thread, which I hope becomes useful!

Thanks for posting what you found, that's good info for future reference.

[98ssnova]

I have a 0-90ohm fuel guage (street rod kit)same as you. If you want to take the set off my hands PM me and we can work something out . Did you use the float that came with the kit?