89 lx fuel gauge not working - Ford Mustang Forum
LinkBack Thread Tools
post #1 of 3 (permalink) Old 11-28-2019 Thread Starter
79347hotrod's Avatar
Joined: Dec 2015
Location: Mechanicsville Maryland
Posts: 50
89 lx fuel gauge not working

I have an 89 lx that had an 85mph cluster, Got a 140mph cluster from a 90 gt a friend parted out. Have done all the wiring changes in connectors. All is working except my fuel level guage, Key on stays at 5/8 tank. Put in 4 gallons of gas to see what happened and did not move until leaving station and headed home moved up to like 3/4 tank. Pretty sure from past that should have moved more. This cluster has anti slosh module. Any way to check the module and the gauge in cluster if I pull back out and check with ohm meter?

Not pretty,But effective!
79347hotrod is offline  
Sponsored Links
post #2 of 3 (permalink) Old 12-01-2019
GT Member
wbrockstar's Avatar
Joined: Aug 2013
Location: Nashville
Posts: 2,178
The link on down this post offers a few solutions to id the sender,gauge or anti slosh module as the cause of your issue,but it doesn't list a specific testing procedure for the module.Once you open the link,scroll to post 2 & begin reading/trouble shooting as stated in the post.
Some members have had success,if the issue is related to the module,by removing the module from the cluster,cleaning the module & cluster contacts with alcohol then reinstalling the module.If that doesn't help, some had stated that the replacement of the large capacitor at the top of the module solved the issue.If you want to try this method,The following info is for the capacitor on the 87-89 module,so check the electrical specs on the capacitor in your 90-93 module to verify if the specs are identical electrically between the capacitors before using the info directly below to buy/order a new capacitor.If different,use the info on your cap instead.BTW- the catalog number listed is for Radio Shack (now closed) so its likely not valid when you're buying a new cap from a different source.

***** 100µF 35V 20% Axial-Lead Electrolytic Capacitor/ Model: 272-1016/Catalog # 272-1016 *****

Members have also mentioned bypassing the module as another option,but if you do that,the gauge needle will bounce around everytime you hang a curve,slam on the brakes,go up or down a hill,etc,but it wont affect the reading once the vehicle is sitting stationary.Another option (although it'll be hit or miss on both finding a car & module or a correctly functioning module) would be to go to your local Pull-A-Part & try to locate a 90-93 Mustang.Im unsure if the modules are identical between the 5.0 & 2.3 models or not because the ads usually just say 87-89 & 90-93,but dont specify if the module is for a 5.0/2.3 or a 5.0 or a 2.3?? However some members have had success at finding working modules at PAP,so its worth a shot,just like cleaning the contacts & replacing the capacitor is.

Here is the trouble shooting thread I mentioned.Good Luck


1991 Mustang lx
D.S.S. 342ci {10.5:1}
TFS 190cc + track heat
Lunati 61011 .549".565"
Pro-M 76mm maf
Jetronic 30lb inj
QA1 Coilovers
17" Weld ProStar XP's
wbrockstar is offline  
post #3 of 3 (permalink) Old 12-11-2019 Thread Starter
79347hotrod's Avatar
Joined: Dec 2015
Location: Mechanicsville Maryland
Posts: 50
Thank for the help.

Not pretty,But effective!
79347hotrod is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may 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
Trackbacks are Off
Pingbacks are Off
Refbacks are On

For the best viewing experience please update your browser to Google Chrome

Search Engine Friendly URLs by vBSEO 3.6.1