# Aftermarket fuel gauge not reading full

**URL:** <https://forums.speedlife.net/t/aftermarket-fuel-gauge-not-reading-full/39324>\
**Category:** NYSpeed Automotive\
**Created:** [November 26, 2007, 11:53pm UTC](https://forums.speedlife.net/t/aftermarket-fuel-gauge-not-reading-full/39324 "2007-11-26T23:53:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\
**Post date:** [November 26, 2007, 11:53pm UTC](https://forums.speedlife.net/t/aftermarket-fuel-gauge-not-reading-full/39324/1 "2007-11-26T23:53:09Z")

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'87 Jeep Wrangler, I assume sending unit in the tank, but I don’t know for sure. Aftermarket fuel gauge. When I fill the tank the gauge only reads 3/4 full. I also know I can drive it for quite a while after it hits empty.  
I’m guessing its a mismatch between the SU and the gauge, but is there any way to fix it using my electronics skills, or do I need to somehow find a gauge made to match my sending unit? (I have no desire to drop the tank and change out the SU…)