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Correct Dip Switch Settings VDO Tachometer
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Hikelite
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PostPosted: Fri Oct 19, 2018 7:11 pm    Post subject: Re: Correct Dip Switch Settings VDO Tachometer Reply with quote

telford dorr wrote:
IIRC, stock type 1 engines redline at 4600; type IV at (around) 5500 (shorter stroke). Thus, 6000 limit at the tach should be fine.


Cool. Then I doubt I have to worry. My bus is a T1, so I should be fine.
I'll post a pic of my build.

Did you ever put yours in an enclosure?
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telford dorr
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PostPosted: Sat Oct 20, 2018 8:55 am    Post subject: Re: Correct Dip Switch Settings VDO Tachometer Reply with quote

No, I never did (being the lazy butt that I am). But it seems happy to just hang out where it is. (I did put a plastic bag over it, to keep it dry.)

I really should put it in a box...
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Hikelite
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PostPosted: Sat Nov 10, 2018 11:21 pm    Post subject: Re: Correct Dip Switch Settings VDO Tachometer Reply with quote

Hi Telford

Thanks again for sharing your schematic.
I have my parts, and am getting ready to build the buffer circuit.
I'm pretty sure I know the answer, but wanted to clarify one detail.
Pin 5 and 7 on the IC are being ignored, right?
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telford dorr
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PostPosted: Sun Nov 11, 2018 9:01 am    Post subject: Re: Correct Dip Switch Settings VDO Tachometer Reply with quote

Correct. The 555 is just being used as a schmitt trigger buffer, not as a timer.
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'71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
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hethen57
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PostPosted: Fri May 15, 2020 5:34 pm    Post subject: Re: Correct Dip Switch Settings VDO Tachometer Reply with quote

Once again, thanks for posting this info. My VDO tach hasn't registered the correct RPMS since I installed it many years ago according to the instructions. Good thing I rely on sound, not the tach, but I knew it shouldn't be wound at 2500 rpms Shocked . Now it finally works correctly! Very Happy
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