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Old 03-10-2011, 08:44 PM   #1
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Help! Fuel sending unit ohms emtpy full

Would anyone know the correct aftermarket fuel gauge that would work in a 98 TJ, it has a 4cyl if it matters. I am putting a SBC in and would like to change to aftermarket gauges. Specifically i need to know what is the ohm reading full and empty. Thanks.

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Old 03-13-2011, 01:17 PM   #2
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With float in up position, resistance should be 20 ohms. With float in down position, resistance should be 220 ohm

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Old 03-13-2011, 09:03 PM   #3
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Originally Posted by Pyro8541 View Post
With float in up position, resistance should be 20 ohms. With float in down position, resistance should be 220 ohm
Thanks, I think I will have to use a programmable fuel gauge. The closest I have been able to find is a 240/33.
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Old 03-13-2011, 09:34 PM   #4
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Just had a thought . I think a 20 ohm resistor in line might work. It would make the empty right on and the full would only be 7 ohms over. The empty is what I am most concerned about. Anyone have any thoughts on this?
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Old 03-14-2011, 08:57 PM   #5
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I just did a new complete guage cluster and the fuel was the biggest problem no one makes one for the TJ. I used custom Speedhut guages. The fuel is programable. Here is a link to them.
Kits Gauge, Speedhut Gauge Series by SpeedHut
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Old 03-14-2011, 09:11 PM   #6
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Originally Posted by Ctflyer View Post
I just did a new complete guage cluster and the fuel was the biggest problem no one makes one for the TJ. I used custom Speedhut guages. The fuel is programable. Here is a link to them.
Kits Gauge, Speedhut Gauge Series by SpeedHut
Very cool...Speedo is programmable also. Thanks for the info.
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Old 03-14-2011, 09:27 PM   #7
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Here is what I went with.
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Old 03-14-2011, 10:21 PM   #8
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Nice! Did you make the cluster plate?
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Old 03-14-2011, 10:55 PM   #9
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Yes. I disassembled the old one and made a plate to fit all of the new gauges.
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Old 08-27-2013, 12:32 PM   #10
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it's an old thread i know but i was wondering if anyone knew what the resistance should be for a 93 wrangler fuel sending unit from empty to full. im trying to install aftermarket gauges but the one i bought isn't reading right. thanks again.

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