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Correct resistance for 1968 temperature sending unit
Hi, I tested my gauge and it goes full Hot when grounded and Cold when disconnected. I measure the sending unit temp with a infrared gun and measured 1.002k ohms at 55 degrees and 195 ohms at 176 degrees. So the gauge and the sending unit are working but I suspect the resistance is wrong. I also checked for 0 ohm between the sensor brass case and chassis ground. 68 like most everything else is one year only since it has a smooth round non threaded stud that the wiring harness pushes on to. I bought the unit off EBay where it stated it was for 57/58 Chevy and 1968 Chevelle and I am starting to doubt the resistance is the same even though the physical connection is the same between the years. BTW my temp gauge read about 1/8 up from Cold at 175 degrees and I suspect it should be at least 1/3 up. Anyone have resistance per temp for a 68 sending unit. Thanks
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Team Member
Join Date: Jan 2018
Posts: 307
Re: Correct resistance for 1968 temperature sending unit
Well I tested a 69 sending unit and it came in around 110 ohms at 175 degrees which is nearly half the resistance at 175 then the one I have which I bet would work but it has the wrong connection type. I found a unit at Echlers that is USA made and is guaranteed to be accurate for a 68 resistance wise. So when I get it installed I will update this. You gotta love a 68, never a boring day. LOL
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Dave
Join Date: Aug 1998
Location: The Republic Of Texas
Posts: 4,510
Re: Correct resistance for 1968 temperature sending unit
If you PM ARK68SS, you will receive he info that you need, including a part #. He helped me out with this a few years back, but that car is gone, and my file went with it.
It is a rare man who can count his own blessings and not mistake them for personal achievements.
"SSuper Dave" Palmer
A.C.E.S. #1483 TC #32 Gold
1970 El Camino Custom, 350/300, needs paint, rust free Arizona car
1968 Caprice coupe, Ash Gold/Ivy Gold, 327/300hp, rally wheels, disc brakes, buckets, console, am/fm and tach dash, tilt and a/c.
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Dave
Join Date: Mar 1999
Location: Near Springfield, MA
Posts: 2,601
Re: Correct resistance for 1968 temperature sending unit
I ran three temp senders on an Automated temperature Calibration System (In a Glycol Bath) years ago. Here's a summary of the raw data where Rs is the temp sender resistance and a picture of some of the GM style temp senders (origin of picture unknown to me).
Dave
USAF Retired (1968-1988)
UTC Aerospace Systems, Space Systems International - Retired (1989-2014)
Last edited by David Bates; Mar 18th, 19 at 1:11 PM.
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Steamy
Join Date: Jul 2003
Location: Here&there, AR
Posts: 6,817
Re: Correct resistance for 1968 temperature sending unit
Llectric Limited is the only supplier of a sending unit for the '68 SS that has the factory gauge setup that actually works properly.
www.llectriclimited.com In the picture in the earlier post (that I think came from LL's site) you need the one on the far left.
BillL
www.llectriclimited.com In the picture in the earlier post (that I think came from LL's site) you need the one on the far left.
BillL
If you keep on livin', you're gonna get old.
Good health is merely the slowest possible rate at which one can die.
Good livin' will speed it up, but it's worth it.
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https://www.chevelles.com/showroom/sh...0/ppuser/15214
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Dave
Join Date: Mar 1999
Location: Near Springfield, MA
Posts: 2,601
Re: Correct resistance for 1968 temperature sending unit
Quote:
Originally Posted by Ark68SS
View Post
Llectric Limited is the only supplier of a sending unit for the '68 SS that has the factory gauge setup that actually works properly.
www.llectriclimited.com In the picture in the earlier post (that I think came from LL's site) you need the one on the far left.
BillL
www.llectriclimited.com In the picture in the earlier post (that I think came from LL's site) you need the one on the far left.
BillL
Dave
USAF Retired (1968-1988)
UTC Aerospace Systems, Space Systems International - Retired (1989-2014)
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