VDO Gauge Guide

nas90tdi

nas90tdi

Well-known member
I know this is hard to find sometimes as it is spread all over the internet.
If you use the light pigtail on the hall effect sensor.


Black goes to #6&8 pins on the speedo
Green goes to the #3 pins on the speedo
Red goes to the #2 pin on the speedo

Red will be your 12V power from the speedo
Green will be your ground from the speedo
Black will be your signal to the speedo and is split across 2 pins.


Someone correct me if I have the signal and power reversed in that example. But, I believe that is correct.
 

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Wilboro

Wilboro

Well-known member
With a 300tdi and the VDO EGT are you guys using the stock sender 323-892? Or one with a longer probe?
 
The Dro

The Dro

Illustrious
nas90tdi said:
I know this is hard to find sometimes as it is spread all over the internet.
If you use the light pigtail on the hall effect sensor.


Black goes to #6&8 pins on the speedo
Green goes to the #3 pins on the speedo
Red goes to the #2 pin on the speedo

Red will be your 12V power from the speedo
Green will be your ground from the speedo
Black will be your signal to the speedo and is split across 2 pins.


Someone correct me if I have the signal and power reversed in that example. But, I believe that is correct.
Click to expand...
Jeebus... The more I read the more I get confused...

Pin 1 (+) goes to #6&8 pins on the speedo
Pin 2 (-) goes to the #3 pin on the speedo
Pin 3 (A) goes to the #2 pin on the speedo

Is this correct?
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chris snell

chris snell

Administrator
Callsign: NW5W
Staff member
I pulled my power feed from my Blue Sea fuse box but otherwise, yes. That's correct.
 
chris snell

chris snell

Administrator
Callsign: NW5W
Staff member
Here's the thing about EGT probes: you can use any probe, so long as it is the correct type for your gauge. The "type" refers to the voltage-temperature curve that's specific to a particular style of probe:

G8ljBmR.jpg


Type "K" is what the VDO gauge uses and it's very common. This is the probe I used:

http://www.auberins.com/index.php?main_page=product_info&cPath=5_22&products_id=182

I used the weld-in bung adapter.

To install it, I took an EGR blanking plate to a machine shop and had them machine a 45-degree hole into it, then weld the adapter bung into that. I painted the resulting plate with high-temp paint and installed it:

 
Bozman

Bozman

Well-known member
Just a quick note. At first I thought my new vdo speedo was inop on my first test drive as the needle didn't move going down the driveway.. Then I noticed the needle moving slightly when I got up to what seemed like 50 mph. Turned out that the VDO tech that set my mileage also set the calibration to 40,000 pulses per mile. I did the auto-calibration by driving one mile and it ended up being around 3,800. Works like a charm.
 
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