displaying posts 1 to 7 of 7

Author Subject: Oil temperature reading (incorrect?)
flynn_

Junior User

Location: Faketown

Registered: 29 Jan 2011

Posts: 59

Status: Offline

Post #1
I've setup an oil temperature gauge for my car, but it only gets to about 50 degrees under normal driving and nearly to 75 when sat idling for a few minutes. If I drive fast it does go up a bit as well, but only a fraction. At first I thought it was a bad earth, but now I've earthed it to a bolt screwed into the chassis and the backlight is also using that earth and it is working fine. I could have sworn when I earthed it to a bolt before with a different wire, it read about 100 degrees which would have been right, however on the earth wire that I am using for the gauge I soldered the wire into the spade plug so it definitely has a connection to it. The other thing is, I am using an 'add a circuit' connector off a switched live from the fuse box, I've got one 15 amp fuse in one slot and nothing in the other, might that have something to do with it?
Posted 15th Feb 2011 at 02:41
daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

Status: Offline

Post #2
100 degrees seems a little warm and 50 seems low, is the guage the right sort to work with the sender?

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Posted 15th Feb 2011 at 02:43
rikky 🦔

Location: cheshire

Registered: 28 Feb 2004

Posts: 26,796

Status: Offline

Post #3
i have this same issue with a gauge i had made, driving me mad Blink

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Posted 15th Feb 2011 at 02:46
flynn_

Junior User

Location: Faketown

Registered: 29 Jan 2011

Posts: 59

Status: Offline

Post #4
daveyboy wrote:
100 degrees seems a little warm and 50 seems low, is the guage the right sort to work with the sender?


Yeah mate, it came with the sender I'm using.
Posted 15th Feb 2011 at 02:57
flynn_

Junior User

Location: Faketown

Registered: 29 Jan 2011

Posts: 59

Status: Offline

Post #5
No one cracked this problem successfully then?
Posted 2nd Mar 2011 at 00:47
phillipm

Seasoned Pro

Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,607

Status: Offline

Post #6
When you say the backlight is using the same earth, do you mean the gauge is earthed to the same point?
Or the sender itself?

Usually the sender earths through the block, but if can't get a clean connection because of oil/dirty threads you might need to run a copper ring connector under it and earth it to the chassis directly.

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Posted 2nd Mar 2011 at 00:52
owain

Seasoned Pro

Location: Essex

Registered: 20 May 2009

Posts: 9,185

Status: Offline

Post #7
Where's the sender? Is it a sump plug one or an inline one?

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Posted 2nd Mar 2011 at 02:27

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