So I am troubleshooting my fuel gauge issue. I bought a new sender and tested it. It  it goes from 1-ohm (empty) to 35-ohm (full). When I test it (outside the tank), when the float is in the up (full) position it only moves the gauge to about 1/2 full. When at the bottom (empty) position the gauge shows empty. This is the same issue I have when I fill and then use the gas in the tank - the gauge never reads ore than half full. Based on what I've read on this thread it would seem like the gauge, not the sender is the issue - do others agree?

If so, anyone got a source for the gauge? Is it easy to replace?

Views: 84


You need to be a member of 63/64 Cadillac Website to add comments!

Join 63/64 Cadillac Website

Comment by John Aguilar on September 26, 2020 at 10:46pm

Hi Karl, I’m chiming in late on this conversation, but I’m reinstalling my gas tank and checked the sending unit out of the car just to confirm it is in good order (haven’t had a full tank in years, though I never recall it being an issue when I drove the car regularly.) What I noted is the unit would settle around the halfway mark when the float arm was at full up position. I didn’t have the ground wire fully tightened down, but notice when I put tension on it to make better contact the gauge would move to Full. We’ll see once I get it back in the car if I am in same boat as you, but what I saw validates what has probably been mentioned by others before me - the connections being clean, tight and to good ground will affect the reading on the gauge.

Comment by Jason Edge on August 27, 2020 at 7:56am

I would pull and test the gauge before replacing it. 15 ohm should put it right at the half tank mark and 30 ohm just past the full mark. 

Comment by Tony and Ginny 429 on August 26, 2020 at 8:00pm

Add Kurt to the helpful list -nice reference post regarding the fuel gauge reading calibration 


Comment by Russ Austin on August 26, 2020 at 7:42pm

I have had minimal success calibrating the gauge. Bets to get a gauge that is know to work correctly.  I have them for 40.00

Or you can try your hand at adjusting the gauge.  Remove the  dash pad and gauge pod. There is a small arm above the coil on the gauge. Bend it closer to the coil.  I dont think you will have success since the gauge is so far off. 

If you want the gauge, send me an email;  I will need your zip code for a shipping quote. 

Comment by Kurt on August 26, 2020 at 4:53pm

Could be gauge calibration. There is some information in the Help section on the topic.

Comment by Tony and Ginny 429 on August 26, 2020 at 4:40pm

Jason or Russ should be very helpful to help get your gas gauge to work correctly 

They do some sort of a calibration to get the gauge to read correctly and have parts if you need them 



  • Add Photos
  • View All


429 restoration

Started by Matti Roth in Restoration Discussion. Last reply by Tony and Ginny 429 30 minutes ago. 6 Replies

Hello, and thanks for adding to group!I am restoring 1964 429 engine which I bought as dismantled. It is said to be smoking in driving and has been stored as parts for a year. It is most probably…Continue

Tags: #429

Current 1963/64 Cadillac Listings on eBay

Started by Jason Edge in For Sale. Last reply by Jason Edge 4 hours ago. 0 Replies

To see all 1963/64 Cadillacs Listed on eBay in the USA…Continue

Tags: ebay

Classic Cadillac Parts For Sale - Misc Items

Started by Jason Edge in For Sale. Last reply by Jason Edge yesterday. 244 Replies

I have posted a few Misc items over on my Classic Cadillac Parts Facebook page at…Continue

Tags: classic cadillac parts, classiccadillacparts

1964 Cadillac parts for sale... northern cali

Started by Jason in For Sale yesterday. 0 Replies

Bill Hirsch cast iron gray exhaust and manifold paint (1 can) $20Bill hirsch Cadillac dark blue engine enamel high temp high gloss (2 cans) $40Convertible top latchValve coversHeadlight bezelRadioGas…Continue

Tags: Parts

Blog Posts

Thank you Kurt re: VIN location

Posted by Robert Pellow on April 19, 2021 at 1:07pm 0 Comments

I just wanted to say a thank you to Kurt for steering me to the tech tips page on V.I.N. locations.  Excellent information.  Thanks a bundle.

Robert Pellow

V.I.N. where?

Posted by Robert Pellow on April 18, 2021 at 1:41pm 6 Comments

Where can I find the V.I.N. on a 63 convertible?  The usual space at the base of the interior windshield on the driver's side has been decimated by weather.

63 Trunk detail

Posted by Bob Pontius on April 8, 2021 at 3:07pm 1 Comment

Jason, I liked the detail and information you have provided. I would like to do mine similar to yours. Can you help? Do you have trunk material? OPGI is sending the trunk product for my 63 Fleetwood. But it does cover the entire trunk as yours was done. If you do not have can you give me a reference? Thanks!! Bob

Car lift and jack stands

Posted by Les Eastling on March 23, 2021 at 10:00am 4 Comments

I mentioned during the 63/64 chapter zoom meeting on 3/21 that we had installed a car lift in our garage. Someone asked what kind and I didn't have the info at hand, so here is a link to it and also a link to some tall jack stands we use to add more stability to the car and an additional safety factor. There is something about getting underneath one of these cars that makes me a little nervous! …



  • Add Videos
  • View All

© 2021   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service