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Old 11-08-2015, 17:08   #1
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VDO Tach

Would anybody have experience on the calibration of a VDO tach which is OEM Perkins installed. I have changed the alternator to a Balmar 100 amp 6 series and installed serpentine belts. The ratio is 3 between the crank and alt sheeves. The tach runs a way faster than the engine is running.



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Old 11-08-2015, 19:45   #2
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Re: VDO Tach

Need a photo tach to check engine and then adjust tach as required.

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Old 11-08-2015, 19:57   #3
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Re: VDO Tach

Or buy a tinytach diesel version and you get a perfect reading !!
Steve .. It was the last one that did this !
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Old 12-08-2015, 05:39   #4
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Re: VDO Tach

VDO publishes the tach calibration procedure on their website. Basically, you push a small button on the back while turning it on, and it goes into calibration mode. You probably won't need to change the number of poles - rather just bump the course and fine calibration to match the new pulley ratio.


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