Mechanical to electronic speedo

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shaihulud
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Mechanical to electronic speedo

Postby shaihulud » Tue May 23, 2017 6:56 pm

I cannot fit a stock Beetle speedo to the instrument panel that is in my current buggy build.

I need a small speedo about 100mm in diameter which runs off the stock Beetle speedo cable with a gizmo that fits to the end of the cable and sends an electrical/electronic read out to the speedo.

The speedo needs to be pedestal mounted and weather proof.

I'm sure that parts are available to do this. I'm thinking of motorcycle speedos.

I'm sure that this has been done before.

Can anyone help me with a few ideas of what works or even might work?

I don't want to go GPS unless there is no reasonably priced alternative.
Vduboy
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Re: Mechanical to electronic speedo

Postby Vduboy » Tue May 23, 2017 9:16 pm

Vdo makes an adaptor to go from the standard vw cable to a hall effect sensor output like most speedos use.
It will all be ok in the end.. if is not ok its not the end!
shaihulud
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Re: Mechanical to electronic speedo

Postby shaihulud » Tue May 23, 2017 10:25 pm

Thanks.

Today I learned that there is an effect called the Hall Effect. New information. I have yet to understand any explanation so far. Electronics is a complete mystery to me.

I'll check VDO and see what can be done.

Thanks again
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VWNuts
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Re: Mechanical to electronic speedo

Postby VWNuts » Fri May 26, 2017 7:39 am

Speedhut make GPS speedos too
shaihulud
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Re: Mechanical to electronic speedo

Postby shaihulud » Fri May 26, 2017 10:06 pm

When I was fitting the Subaru engine to the Manx SR I needed to fit a small mechanism to the end of the speedo cable at the input to the speedo. It was connected to the computer. Without it the engine could not read the cars speed.

Was that a Hall Effect signal generator? If so, is that what I need?
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VWNuts
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Re: Mechanical to electronic speedo

Postby VWNuts » Sat May 27, 2017 9:03 am

You can buy a VDO signal generator that fits onto your speedo cable. Not sure of the part number, but Toddy knows it
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toddy101
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Re: Mechanical to electronic speedo

Postby toddy101 » Sun Jul 09, 2017 11:08 am

Sorry for the late reply (havn't logged on for a while) the part you are after is a VDO 412.009. Goes on the end of a conventional VW (or other) speedo cable and puts out 5 pulses per wheel rev.
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