VDO tach set up - Defender Source
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  #1  
Old August 13th, 2016, 04:37 PM
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Bill Campbell
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So I have all new VDO gauges. Fuel and Water Temp seem to work fine but my tach part no 333 158 seems to rev high. Like it says my idle is at 3500, which it is not. Sounds like it is idling fine so like 800 or so. Any ideas?
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  #2  
Old August 13th, 2016, 05:43 PM
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John B.
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The tach must be adjusted to match your setup. Rough adjustments are with a dip switch and fine adjustments with a screw. This should be explained in the instructions that came with it. The easiest method is to pick up a laser tach. They are $15 or $20,
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Old August 13th, 2016, 10:54 PM
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Bill Campbell
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Ya I think I have the dip switches right but where is the fine adjustment for the screw?

------ Follow up post added August 13th, 2016 11:58 PM ------

Quote:
Originally Posted by Red90 View Post
The tach must be adjusted to match your setup. Rough adjustments are with a dip switch and fine adjustments with a screw. This should be explained in the instructions that came with it. The easiest method is to pick up a laser tach. They are $15 or $20,
Also laser tach purchased. Thanks for that.
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  #4  
Old August 14th, 2016, 07:20 AM
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John B.
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If you are 3500 at idle the dip switches are wrong. It should be close with the dip switches. The screw is in the side.
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Old August 14th, 2016, 01:17 PM
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Bill Campbell
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Ya I followed the instructions for the dip switch but obviously am wrong. Good to know though. Ill just play around with the switches. I will have to look closer for the screw on the side. One instruction sheet said it was on the side and one said it was below the male pins on the back.
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Old August 14th, 2016, 03:15 PM
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The instructions are here: https://www.vdo-gauges.com/media/ins...0Diameter).pdf

Which setting did you use?
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Old August 14th, 2016, 05:01 PM
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Bill Campbell
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Quote:
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The instructions are here: https://www.vdo-gauges.com/media/ins...0Diameter).pdf Which setting did you use?
I followed those but I am an idiot so really anything is possible.

B
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  #8  
Old August 14th, 2016, 07:29 PM
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  #9  
Old August 25th, 2016, 05:51 PM
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What dip switch setting did you ultimately use?

I'm assuming the Ducati setting isn't correct......
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  #10  
Old August 25th, 2016, 06:55 PM
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Bill Campbell
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Doing it this weekend. Ill report back when/if I figure it out.
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Old August 25th, 2016, 07:03 PM
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I think I got it figured out.

I switched all to OFF... er.... maybe.

Anyway, that brought the RPM setting down to 1000 from 5000 while at idle.

Then I took some white paint and made a mark on the main engine pulley, and used an iPhone app to confirm that the thing was spinning at 840 rpm or so at idle. Then I used the screw driver in the side to match the gauge to what I was seeing from the iPhone.

I can't tell how absolutely accurate this is, but it seems right. And RPMs are doing what you would expect when you push the pedal. I'll have someone check it some time to see if it is accurate.
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  #12  
Old August 26th, 2016, 01:10 AM
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Bill Campbell
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So you have them all off? I swear I have it set up like the instructions and it is way off. Ill start with all off this weekend and just go from there.
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Old August 26th, 2016, 02:01 AM
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Yes, they are all one way or another. I can't see it now, but if I remember right, I oriented it the way the diagram said on the instructions, and switched them all down to the OFF position.

I started the engine up an hour or two later, and the tach was responding as it should, and idle was at 850 or so (small scale, hard to tell exactly).
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  #14  
Old August 26th, 2016, 11:16 AM
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Bill Campbell
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I can figure it out. I am just going to start with all of them off and see what the tach does and go from there.
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  #15  
Old August 28th, 2016, 04:29 PM
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Bill Campbell
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So ya I turned all switches to off/down to where the little numbers are painted and it registered much closer to accurate. I dont really care that it is super accurate so I didnt adjust the side. Now if I can just get the Speedo working I will be done.
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