Speedometers

Volkswagenboy Staggers Automotive.

2,437 posts · joined Jul 2005 · 27 Dec 2005, 3:28 pm

#441500

Has anyone any information on converting an analogue speedometer to a digital type?
Thanks.

STAGGERS AUTOMOTIVE - Heavy Vehicle Diesel Specialist

JB CUSTOMS & CLASSICS - Car Builders

2/53 Tradelink Drive, Browns Plains

modulus Veteran Volks Folk

2,009 posts · joined Jul 2003 · 27 Dec 2005, 5:08 pm

#441522

Most air-cooled speedos are analogue, driven by a cable from the front-left wheel bearing; the speedo instrument itself makes sense of the rpm of the cable and indicates a speed.

An analogue speedo needs a digital signal fired every time something speed-related happens (e.g. every time a magnet on the output side of the differnetial passes a coil).

Depending where you're going with this you can either continue with the cable-driven speedo and get an instrument tech. to convert it to digital activation (but what is achieved?) or you can create a Vehicle Speed Sensor (VSS) using magnetic pickups on e.g. the flanges of CV joints which would then be suitable as input for a number of other instruments.

I'm building an electronic speed alarm for my Transporter at the moment, and I'll use 8 magents spaced around a CV flange to cause a pulse through a stationary coil as the speed input; this will give me a digital speedo as well as the speed alarm; I'm leaving the analogue speedo intact.

Other folk on this forum are trying to solve the problem of how to feed their VSSs for fuel injection systems. The Search button is your friend.

hth

Peter Hill
1975 Type 2 Double Cab
modulus.com.au

Volkswagenboy Staggers Automotive.

2,437 posts · joined Jul 2005 · 27 Dec 2005, 8:26 pm

#441560

True, true.

STAGGERS AUTOMOTIVE - Heavy Vehicle Diesel Specialist

JB CUSTOMS & CLASSICS - Car Builders

2/53 Tradelink Drive, Browns Plains

helterskelter400 Fahrvergnugen

900 posts · joined Aug 2002 · 27 Dec 2005, 8:56 pm

#441575

$19.99 base model push bike speedo will do. you can of course spend much much more..., lengthen wires and inspect front brake/hub area with some liquid nails with the enclosed sensor and magnet.

an alternative, hardwire a gps in and mount it on dash......

edit
found it... here's a pic when i had the bike speedo on....

[ Edited on 27-12-2005 by helterskelter400 ]

:thumb

11CAB If ya got it....Baja it

4,674 posts · joined Aug 2002 · 27 Dec 2005, 9:26 pm

#441591

I see your a Cat lover Helterskelter.......:P

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helterskelter400 Fahrvergnugen

900 posts · joined Aug 2002 · 27 Dec 2005, 9:45 pm

#441607

no, you got it all wong... i love cats... but only after they've been processed by the local chinese takeaway. haha

:thumb

blutopless2 DAMSLO

2,457 posts · joined Jan 2004 · 28 Dec 2005, 6:43 am

#441660

i will eventually be doing this for my speedo when i change over to the VDO vintage series. The new speedo requires a digital signal. There is a converter which is used with this speedo that converts from the cable rpm to a digital signal which is wired to the speedo. I am intending to use a speedo place to set this up for me.

see.... air and water do mix 😉

1974 1300
1997 MK3 Golf GL
2003 NB Cabrio
2012 Golf VI GTI
2014 Audi A4 Quattro