VDO Gauge Parts/Installation/Problems Merged Threads - Page 17 - Defender Source
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  #321  
Old July 30th, 2016, 09:52 AM
Sand110
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Steve Day
1988 110 County Station Wagon
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This is what I'm getting at the tank.
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  #322  
Old July 30th, 2016, 09:57 AM
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John B.
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Originally Posted by Sand110 View Post
Thanks Red90, I purchased this model from Merlin Motorsport:

https://www.merlinmotorsport.co.uk/p...type-301010002

I did the wiring myself and is correct.
That is the wrong gauge. It is a VDO range (10 to 180 Ohm) one.

You need 301-105 with a 240-33 Ohm range.
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  #323  
Old July 30th, 2016, 05:02 PM
Sand110
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Steve Day
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Argh. So frustrating! Thank you!
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  #324  
Old July 30th, 2016, 05:27 PM
Sand110
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I see, only available for purchase from the US. Will have to just take the hit on the shipping unless anyone knows a UK provider?
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  #325  
Old August 25th, 2016, 04:15 PM
RBBailey
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What do you all do with the extra length of EGT signal wire? I have no room to cool it behind dash anyplace.
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  #326  
Old August 25th, 2016, 04:21 PM
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Coil it in the engine compartment.
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  #327  
Old August 25th, 2016, 04:26 PM
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Umm, trim the wires to whatever length you want.
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  #328  
Old August 25th, 2016, 04:39 PM
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Instructions say not to clip wires.

Didn't feel like having it just coiled in the engine compartment, but I think I may have an option to put it over the wheel well, under the wing.
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  #329  
Old August 25th, 2016, 04:44 PM
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Instructions say not to clip wires.

Didn't feel like having it just coiled in the engine compartment, but I think I may have an option to put it over the wheel well, under the wing.
What instructions? That is silly. There is nothing special with regard to lead length on a thermocouple. The biggest no-no is differing metals, but Madman does not seem to care as he is not using proper thermocouple wire.
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  #330  
Old August 25th, 2016, 05:14 PM
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Right... I have no clue. Not like I'm building a nuclear device here, or anything. But someone mentioned it to me that they had to replace their wires because they cut them, then I found this: https://www.google.com/url?sa=t&rct=...fTfc1IEba9f3Zw

First thing: DO NOT CUT SENDER WIRE !!

So call me baffled, but I'm just following instructions.
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  #331  
Old August 25th, 2016, 05:22 PM
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I used an Auber EGT probe. Here is a quote from their instruction page:

"NOTE: Do NOT cut or splice the thermocouple lead wire as it is special wire that provides correct reading to the gauge. Simply coil any excess wire out of the way."
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  #332  
Old August 25th, 2016, 05:40 PM
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It does not matter to trim the wires. You want avoid junctions with other metals as it creates a second thermocouple. With the Madman you have to do it as they do not include proper K type wire in their harness.

In a normal TC installation in industry you use wires and junctions that match the metal types used in the TC. Length of the wires has no impact on accuracy.
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  #333  
Old August 25th, 2016, 05:47 PM
RBBailey
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I was trying to figure it out, and I think they must just be trying to make sure people don't mess up the wires by putting junctions in it, or by using the junction they have (with the screws) improperly. Like trying to solder it together or something. Just telling people not to cut it at all covers all the bases.
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  #334  
Old August 25th, 2016, 06:23 PM
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Maybe instead of solid TC lead wire they use a plated wire and cutting the ends gets away from the plated sections. Because we are measuring at a high temperature I doubt the ambient junctions impact accuracy enough to matter. Obviously Madman does not care as they use copper leads that require junctions.
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  #335  
Old August 25th, 2016, 06:32 PM
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I made the same mistake when installing my vdo egt. Since it came with no instructions I just started installing and clipped the long extension wire to size.

Frankly it didn't seem to make it not work. Maybe slightly less accurate but who really knows... Gauge works fine
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  #336  
Old August 25th, 2016, 06:34 PM
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Reading a bit. It is okay for the copper lead junction, but both junction must be at the same temperature and should be close to the instrument so that the cold junction compensation within the instrument is at the same temperature as the extension lead junction with the dissimilar metals.
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