Trying to install a VDO oil presure sending unit - Defender Source
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Old September 14th, 2013, 07:36 PM
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Trying to install a VDO oil presure sending unit

I am trying to install a VDO oil pressure gauge and was told I needed a VDO sender.............so Summit Racing sent me one they said would work but the it is a 1/4-18npt and I need a 1/2-20 unf for my engine 3.5. Anyone know where I can get an adapter? They told me they do not have the size I need, but told me I need a VDO sender for the VDO gauge.


This is what I need

1/4-18 npt female to 1/2x20 unf male adapter
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Old September 14th, 2013, 08:30 PM
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Check this out...

Quote:
Originally Posted by usadventureracing View Post
I am trying to install a VDO oil pressure gauge and was told I needed a VDO sender.............so Summit Racing sent me one they said would work but the it is a 1/4-18npt and I need a 1/2-20 unf for my engine 3.5. Anyone know where I can get an adapter? They told me they do not have the size I need, but told me I need a VDO sender for the VDO gauge. This is what I need: 1/4-18 npt female to 1/2x20 unf male adapter
I bought my first VDO from Summit and then found this place which is better:
http://www.egauges.com/VD2_main.asp

Didn't check, but try: http://www.adaptall.com/
They may have an adapter that will work or if you or get a 1/2-20 unf bolt and screw it in and then it can be drilled and tapped to 1/4-18 npt.

Be specific in how you draw your current for the electric VDO gauges.
Sharing ground or a positive current source will GREATLY effect the gauge readings.
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Old September 14th, 2013, 10:20 PM
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Quote:
Originally Posted by rdavisinva View Post

Be specific in how you draw your current for the electric VDO gauges.
Sharing ground or a positive current source will GREATLY effect the gauge readings.
Could you explain this a bit more ... Not sure I follow.
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Old September 14th, 2013, 10:27 PM
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There is a thread on here with all the part numbers for VDO to include Vision series gauges and correct senders to use as well as the adapters for both V8's and tdi's. I think the original thread was by The Dude/DJ Menasco.

http://www.defendersource.com/forum/...eferrerid=3511
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Old September 15th, 2013, 09:35 AM
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Than you for the responses but still cannot find any info.
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Old September 15th, 2013, 11:11 AM
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It's basics really when you think about it...

Quote:
Originally Posted by leastonce View Post
Could you explain this a bit more ... Not sure I follow.
I do not know the exact gauge you purchased, but think based on your first post that it an electric gauge and not a mechanical gauge.

An electric gauge takes voltage readings and depending on voltage moves the needle on a scale to provide a reading. How accurate that reading is directly dependent on the voltage the gauge receives. Most all these type of VDO gauges have a connection for positive current, a connection for negative current, and a connection for the sender which supplies varying negative current in this case depending on the oil pressure. Lower pressure = lower voltage and likewise higher pressure = higher voltage via the sender.

OK easy to follow so far.

So lets say you take your positive current from your green circuit which is current from the ignition switch, through a fuse and to your gauge. You also decide to take the negative current off the ground for the back of all the gauges. Sounds like an excellent idea, right?

WRONG!!!!!!!

The green circuit also supplies (+) current to a variety of other devices like the blower fan. Likewise, the (-) for the back of the gauges feeds the dash lights at a minimum. In this case when you switch on the blower and or dash lights, the gauge reading will go down and when you turn them off the gauge reading will go up.

I will share with you how I fix this problem. Get the correct size ring connector and run a brown wire from your positive cable on your starter from the battery to a 12V relay. Have the switching means for the relay come off of your white or green circuit. If you don't know how to hook up a relay, goole it as there are dozens of explanations. Run a separate ground wire somewhere off the body, frame bulkhead whatever.

The VDO gauges have a built in current stabilizer that runs on a fixed voltage so when your alternator is putting 14.3 volts or 12.8 (say at idle), it will only use something like 12 volts.

BUT

When the current drops below the current threshold as described here, the gauge readings will be bogus.

Hope this helps.
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Old September 15th, 2013, 11:13 AM
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Quote:
Originally Posted by usadventureracing View Post
Than you for the responses but still cannot find any info.
You went in here?

http://www.defendersource.com/forum/...ght=vdo+vision
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Old September 15th, 2013, 11:31 AM
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Quote:
Originally Posted by usadventureracing View Post
I am trying to install a VDO oil pressure gauge and was told I needed a VDO sender.............so Summit Racing sent me one they said would work but the it is a 1/4-18npt and I need a 1/2-20 unf for my engine 3.5. Anyone know where I can get an adapter? They told me they do not have the size I need, but told me I need a VDO sender for the VDO gauge.


This is what I need

1/4-18 npt female to 1/2x20 unf male adapter
This is what I have used. A 1/2 to 1/4 adapter are fairly easy to find. Think I found a brass one @ the local hardware store.


http://www.egauges.com/vdo_indS.asp?...DO&PN=360-019B
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Old September 15th, 2013, 04:32 PM
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I found a brass brake line fitting the has the two exact threads I need. I just need to drill out the center flare so the sender can bottom out.

Thanks for everyone's help
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Old September 27th, 2013, 03:30 PM
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What oil pressure should I be getting for a 3.5?

Thanks
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  #11  
Old February 9th, 2014, 04:45 PM
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For those who have installed the VDO oil sender on the 300 Tdi, did you screw it right on the filter bracket or did you use an adapter to get more room ?
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Old February 10th, 2014, 07:07 PM
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Quote:
Originally Posted by JFD View Post
For those who have installed the VDO oil sender on the 300 Tdi, did you screw it right on the filter bracket or did you use an adapter to get more room ?
Installed the sending unit for the VDO (a big bulb looking thing with 2 leads) on the OM617.
I used a rubber flex line and located it away from the engine zip tied out of the way.

On the 300TDI, I use a banjo adapter to use both the low pressure warning light and the oil pressure sending unit.
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UD: "Just Power through it man!"
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Old February 11th, 2014, 09:40 AM
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Quote:
Originally Posted by rdavisinva View Post
On the 300TDI, I use a banjo adapter
I've been looking all over for a m10 male to m10 female adapter or elbow and found zip

Can you point out a part or a supplier ?

Thanks

Cheers
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Old February 11th, 2014, 10:24 AM
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I found this website and plan to use the stock idiot with an aftermarket gauge. I think this should get the job done, but haven't fitted it yet.
http://www.speedograph-richfield.com...ipe_lines.html
They were fast on the shipping too.
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Old February 11th, 2014, 12:23 PM
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Quote:
Originally Posted by JFD View Post
I've been looking all over... Can you point out a part or a supplier ? Cheers
I bought my last few banjo adapter setups from Rovers North.

Quote:
Originally Posted by Broncoduecer View Post
I found this website and plan to use the stock idiot with an aftermarket gauge. I think this should get the job done, but haven't fitted it yet.
http://www.speedograph-richfield.com...ipe_lines.html
They were fast on the shipping too.
This esentually does the same thing, although with a "T" instead of a banjo fitting.
It is configured for a mechanical gauge rather than one with a 12V sender, but see no reason why it wouldn't work as long as your threads match.
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Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)

"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"
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  #16  
Old February 11th, 2014, 02:47 PM
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Quote:
Originally Posted by Broncoduecer View Post
I found this website and plan to use the stock idiot with an aftermarket gauge. I think this should get the job done, but haven't fitted it yet.
http://www.speedograph-richfield.com...ipe_lines.html
They were fast on the shipping too.
You found it

I can use the TPVW and plug the1/8 take off.

Great.

Thanks
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