Temp Sender
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
2nd... you can cut the threads down on a lathe to 3/8 NPT. Any machinist with a lathe should be able to do that for you.
Thread Starter
Melting Slicks
Joined: Oct 2013
Posts: 2,569
Likes: 126
From: San Diego California
I used one like this on my 79....works just fine. I had the same problem with my new Dart heads....I spent way to much time finding this solution.....anyway, here it is:
this one is from an 81 corvette - should work just fine:
http://www.autozone.com/autozone/par...05_77401_8456_
Hope this helps,
Gary
this one is from an 81 corvette - should work just fine:
http://www.autozone.com/autozone/par...05_77401_8456_
Hope this helps,
Gary
Thank you sir.
Steve
Le Mans Master
Joined: Oct 2007
Posts: 7,410
Likes: 949
From: Tennessee/Rhode Island
I used one like this on my 79....works just fine. I had the same problem with my new Dart heads....I spent way to much time finding this solution.....anyway, here it is:
this one is from an 81 corvette - should work just fine:
http://www.autozone.com/autozone/par...05_77401_8456_
Hope this helps,
Gary
this one is from an 81 corvette - should work just fine:
http://www.autozone.com/autozone/par...05_77401_8456_
Hope this helps,
Gary
Thread Starter
Melting Slicks
Joined: Oct 2013
Posts: 2,569
Likes: 126
From: San Diego California
I'll let ya know what mine does too JB.
Steve
Drifting
Joined: Dec 2004
Posts: 1,714
Likes: 42
From: Austin Texas
Willcox wrote a fantastic article on this subject. They mapped out the Ohm readings needed for all the different year Corvette temp gauges.
This will allow you to test your sender or the sender you purchase to see if it is going to read correctly.
http://willcoxcorvette.com/repairand...elp.php?hID=96
Good post here on how to take the measurements from the sender
http://forums.corvetteforum.com/c3-t...ding-unit.html
If you have a digital meet thermometer you can add it to your pot of water to get the readings at the appropriate temp that corresponds with the gauge.
This will allow you to test your sender or the sender you purchase to see if it is going to read correctly.
http://willcoxcorvette.com/repairand...elp.php?hID=96
Good post here on how to take the measurements from the sender
http://forums.corvetteforum.com/c3-t...ding-unit.html
If you have a digital meet thermometer you can add it to your pot of water to get the readings at the appropriate temp that corresponds with the gauge.
Le Mans Master
Joined: Jan 2001
Posts: 6,656
Likes: 1,357
I used this sender on my 68...
I installed it in my vortec heads. I also kept the original in the intake manifold. Gauge reads about the same for both.....and I have the temp sender that goes to the computer to compare it with.
Both of the senders to the gauge read a little low......so I'm figuring my gauge is off.
http://forums.corvetteforum.com/c3-t...tec-heads.html
Both of the senders to the gauge read a little low......so I'm figuring my gauge is off.
http://forums.corvetteforum.com/c3-t...tec-heads.html
Melting Slicks
Joined: Aug 2012
Posts: 3,487
Likes: 83
From: Titusville Florida
So are all sending units basically the same as far as sending resistance (if that's the correct terminology). Would once from an 81 work for a 76, other than the 3/8 vs 1/2 threads.
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Le Mans Master
Joined: Jan 2001
Posts: 6,656
Likes: 1,357
try the TU66 from autzone....
it's under 20 bucks and an easy check..... this is the guy I used. I still have it installed on the head and I swap my lead over to it occasionally just to check that it reads about the same as the original. It does. My gauge is goofy...it still reads low as I can tell from my computer temp monitor.
http://www.autozone.com/autozone/par...er=129205_0_0_
http://www.autozone.com/autozone/par...er=129205_0_0_
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
Wilcox has some explanations, with pictures, showing the relationship.
Pete
Drifting
Joined: Dec 2004
Posts: 1,714
Likes: 42
From: Austin Texas
check out the link to the document from Willcox. They have done all the heavy lifting on this and documented it on a pdf.
68-74 gauge at 210* = 79 ohms
75-77 gauge at 200* = 79 ohms
80-82 gauge at 200* = 146 ohms
68-74 gauge at 210* = 79 ohms
75-77 gauge at 200* = 79 ohms
80-82 gauge at 200* = 146 ohms
Le Mans Master
Joined: Jan 2001
Posts: 6,656
Likes: 1,357
Petez06 has a good point......
but for about 16 bucks it's worth a try. I was looking at that contraption to tweak the parallel resistance on the gauge (I believe it's Wilcox too?) and I may do it someday, but for now I'm ok with "trending" and my computer display temp.
Advanced
Joined: Nov 2013
Posts: 82
Likes: 0
I was in the same spot when I put my new dart heads on. The sensor would not fit. I put it in the intake manifold. Edelbrock 2101. Only thing is the gauge now sits at 250° or so. BUT according to my laser reader the block and heads are only 200° or 205°
Le Mans Master
Joined: May 2007
Posts: 5,007
Likes: 1,114
From: North tonawanda NY
I just went through this myself with dart heads and decided to mount my old sender in the intake manifold.
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
Did you by chance put sealer on the sender threads? That's a possible explanation for the higher reading. You could take an ohmmeter and check the resistance between the sender body and the intake. Should be zero ohms.
As I stated before, mine reads correctly in the intake.
Pete
Advanced
Joined: Nov 2013
Posts: 82
Likes: 0
I did put sealant on the the first couple threads. The brush on permatex. I'll have go back out and check the ohms. I know it's not overheating but there's still that feeling when you look down and see the gauge so high. Like oh man
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
That temp sensor is a "thermistor" which has a negative temp coeficient which decreases resistance with increasing temp and on top of that it is very non-linear. The match resistance trick wont work. U need a matching "thermistor".
Sorry for the bad news as i hate to be the party pooper here. But the solution is to contact delphi or whoever and get a 3/8" match. FYI Delphi didnt respond to my email.
