Adjust Temp Guage ??
Thread Starter
Instructor
Joined: Feb 2010
Posts: 112
Likes: 0
From: Gillette Wyoming
Adjust Temp Guage ??
Today got a temp guage to check the one installed in the guage cluster, found out the one in the car was reading about 50* to hot can I use some resitors to correct it or have to to try to find a more accurate sender. Think a couple Radio Shack resitor will work or am I wrong.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Adding a resistor in the green sender wire will lower the gauge reading BUT its possible the reading you dial in will be the only accurate reading you will have. Both side of the temp you dial in could be way off.
You should try to determine if your sender is wrong or the gauge and wiring is causing your problems.
You should try to determine if your sender is wrong or the gauge and wiring is causing your problems.
Racer
Joined: Apr 2004
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New England Events Coordinator
Last edited by phclub; May 24, 2010 at 05:22 PM. Reason: update supplier
Thread Starter
Instructor
Joined: Feb 2010
Posts: 112
Likes: 0
From: Gillette Wyoming
Got a new sender from Napa looked the same as OEM, just did not want to have to buy a dozen different senders to find one that was accurate. Maybe I will just change my guages to new ones my oil pres is only one that works right.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
That might be an indication its not a gauge problem but a common between all the gauges , possible grounding problem. The entire center gauge cluster( and the wiper switch) is grounded by the center wire terminal of the water temp gauge.
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
I just installed the sender from Lectric Limited....
Factory gauge/Mechanical
Halfway between 100 and First Mark (180*) / 160*
First mark(180*) / 182-185*
210* / 208*
Pretty close at some points, the factory gauge definetly reads cooler on the low end of the range.... Mechanical is installed in the intake, stock sending unit for the factory gauge is in the driver side head between #1/#3.
That being said, I still run both gauges, I just hide the mechanical gauge up behind the console and pull it out to check it every now and then...
Factory gauge/Mechanical
Halfway between 100 and First Mark (180*) / 160*
First mark(180*) / 182-185*
210* / 208*
Pretty close at some points, the factory gauge definetly reads cooler on the low end of the range.... Mechanical is installed in the intake, stock sending unit for the factory gauge is in the driver side head between #1/#3.
That being said, I still run both gauges, I just hide the mechanical gauge up behind the console and pull it out to check it every now and then...
Thread Starter
Instructor
Joined: Feb 2010
Posts: 112
Likes: 0
From: Gillette Wyoming
Maybe, Fuel gauge is crazy thuoght it was the sender, clock running slow, you know the temp, amp do not do a thing, oil OK mech sender. will dig into it nextday off will check the ground. I had the inside gutted over the winter
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Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Get a piece of wire and ground it to the battery neg or back of alt and touch to the metal cluster , if things straighten up make sure the 14 black going to the temp gauge is grounded but also make sure the center spade actually grounds to the metal housing. Sometimes an insulating washer is put under the spade and ruins the ground to the cluster.
Wilcox has a pic I'll see if I can find it.
Wilcox has a pic I'll see if I can find it.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Dang Ernie it took me forever to find this link to the picture,your going to have to show me where the INDEX is to the help section. 
Letournour there is NO washer under the 9 oclock stud.
http://willcoxcorvette.com/instructi...ions_68-82.jpg
Letournour there is NO washer under the 9 oclock stud.
http://willcoxcorvette.com/instructi...ions_68-82.jpg
Race Director
Joined: Dec 2007
Posts: 14,345
Likes: 4
From: Hartselle AL
St. Jude Donor '09
After getting one of these, no more issues. Not guaranteeing that is your problem but it was for me. Zip part number: M-3519
http://www.zip-corvette.com/ProductDetails/ProductDetails.aspx?pid={95511468-8EF2-42B7-9397-FA5BD49EF76A}&gid={FD6A3ED2-95A9-47BC-BE90-BD2974F4F140}&pname=72-78+Temperature+Sending+Unit+%28Correct%2 9&Referer=&Alias=&ptct=SGR-SR&CTitle=&
Thread Starter
Instructor
Joined: Feb 2010
Posts: 112
Likes: 0
From: Gillette Wyoming
That the problem I did not take it apart and thought there was not resistor on the back under there my other resistors old and broken on the fuel replaced but did not on the temp. Like I said this week end think I will take it totally apart and take a good look at everything, Belive that is a 90 ohm 5volt had a hard time finding a 5volt last time.