The 1947 - Present Chevrolet & GMC Truck Message Board Network

Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Electrical


Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 08-23-2014, 02:10 PM   #1
Cluster King
TBONE1964's Avatar
Join Date: Nov 2012
Location: Junction City, OR
Posts: 4,778
67-72 Chevy Truck fuel gauge diagnostics 101

Hello all,

It has come to my attention that there are a few people out there that are having trouble figuring out if it is there fuel sending unit, gas gauge, or something in between that is causing there fuel gauge to not read correctly.

My goal here is to show some basics and also show what happens when you loose ground or power to the sending unit or gauge. Please bare with me and ask questions. I am going to attempt to make this as clear as possible.

The first set of photos is showing what you have and what you need to diagnose a sending unit and gauge.

The two basic tools I use for my testing are a known good sending unit and a DVOM (digital volt ohm meter) set to the OHM 200 scale. For my testing I also use a battery carger set on 10 amp to simulate a 12V car battery.
Attached Images
Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at

Also see my facebook page, classic gauge and cluster.
TBONE1964 is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -4. The time now is 11:40 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013