1956 T-bird correct fuel sender unit

[dustinp]

I have a '56 T-bird with a defective(and I think original) fuel sender. Looking at various vendors offerings leaves me a bit confused as to which one I need. I see ones with various ohm readings from 70-10, 33.5- 240, and 100-300., all claiming to be for a '56. I believe my gauge is original since I have not replaced it in the 32 years I have owned it, and it deflects to full when the sender wire is grounded indicates it is OK. But the old sender is not working, so I can not measure it's ohm reading to know what it's replacement should be. Any help would be greatly appreciated.
Thanks!

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[jack-in-sac]

Where are you located? It is easier to advise someone when we know what part of the country they are in. Where have you looked for a replacement? Most of the reputable early bird specialist suppliers will have what you need.

 

[dustinp]

We live in east central MN. I've actually called several vendors like NPD, Hills restoration, Amos Minter, and none of the ones I called had a definitive answer. Tanks Inc shows all pre '86 Fords use 70-10 ohm senders: https://www.tanksinc.com/index.cfm/page/ptype=results/category_id=159/mode=cat/cat159.htm
Auto City Classics shows a 70-10 for '55 and a 33.5-240 ohm for '56 : https://www.autocityclassic.com/195...ks/1955-1956-ford/mercury-sending-unit-f31su/ NPD has this one listed for the '56, which is 70-10: https://www.npdlink.com/product/sending-unit-fuel-level-stainless-steel-direct-fit/214379?backurl=search/products?search_terms=fuel%2Bsender%2Bunit&top_parent=220002&year=1956&year=1956 Fordification seems to verify Tanks Inc info : https://www.fordification.com/tech/fuel-sending-units.htm
In talking to CASCO they said their's was like 100 -300 ohm if I remember correctly now. After hearing and seeing so many different sources, it starts getting hard to keep who said what straight, but I think the above is close.

 

[dustinp]

Update-I decided to get the 70-10 Ohm unit from Auto City Classics. I got it home and used jumper wires to connect the center post of the sender to the wire going to the gauge and another to ground the sender tank attach plate to ground. I found that the fuel gauge would indicate full with the float raised completely, but would only go down to about 3/4 full when lowered completely. So since their shop is only about a half hour drive away, I exchanged for the one they had listed for a '56, which the 33.5 -240 ohm one. When I hooked that one up the same way the gauge did run through it's complete range. So for anyone interested, that problem is solved, and I hope it will help someone else out,

 

[Grabber429]

Sorry no one had replied , but thank you for adding the detail in the last post, it will help many for the future.

 

[dustinp]

Glad someone read it. I have been driving the car with the new sender for about two months now, and that's been long enough to have the gas gauge run it's full range, which it has done without a problem, so that is further confirmation that the 33.5-240 ohm sender is what worked for my '56 bird.