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Replica GPS speedo
Posted: Mon Oct 31, 2016 12:25 pm
by 7osh
Has anyone had experience of fitting a gps speedo? I purchased one from Sierra Madre, but the wiring diagram does not relate to the gps antenna. Essentially the diagram show 3 wires whereas the antenna has 4 wires. Help please!! thanks
Re: Replica GPS speedo
Posted: Mon Oct 31, 2016 1:13 pm
by Robneal
Got some photos of the antenna connections??? Normally a car antenna has 2 x wires for cellular connections for 3G 4G a GPS connection and a WiFi connection. Try looking on panorama antennas website and there is lots of info there that can help you identify which connection is which.
Sent from my SM-G930F using Tapatalk
Re: Replica GPS speedo
Posted: Sun Jan 08, 2017 8:09 am
by H-G
I'm fitting the VDO electronic speedo to my 356; it come with the GPS signal generator however if you need to IVA your car then the GPS version is not compatible and you need a mechanical signal generator.
If you have the VDO GPS set up then:
Red from GPS unit is 12v supply (this can be either per extant or switched, but if the latter it will take a few seconds for the unit to resetablish a GPS connection; if the former you will have a continuous small drain on your battery)
Blue from the GPS unit is to earth
Green from GPS unit is to the W terminal on the VDO speedometer.
I now have an EMPI mechanical signal generator (others are available but it needs to create 4 pulses per revolution) -
https://www.vwheritage.com/shop/V340000 ... tartRow=99