gps speedo conversion

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=136400
Printed Date: September 20, 2024 at 8:02 PM

Topic: gps speedo conversion

Posted By: hilla311
Subject: gps speedo conversion
Date Posted: April 06, 2014 at 6:19 AM

Has anyone fitted a GPS module/pulse antenna, to a oem electric speedo?

posted_image

Something like this marine one, a few other manufactures make them for the gauges like auto meter

Replies:

Posted By: oldspark
Date Posted: April 06, 2014 at 6:55 AM

Yes.

Posted By: harryharris
Date Posted: April 06, 2014 at 8:22 AM

And it will be a minimum of 5-10 seconds behind your real speed.
I use mine as a true speed back-up, most OEM speedos are about 2-3% fast.

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Test before boxing up.

Posted By: oldspark
Date Posted: April 06, 2014 at 10:09 AM

Is that due to that unit?
GPS units themselves should be quick. I haven't noticed any delay on any of mine once they lock in. And of course tunnels and buildings are problem.

Posted By: harryharris
Date Posted: April 06, 2014 at 10:19 AM

You can work it out it's probably 1-2 seconds, time from signal pickup to chip to output.
Cold foggy UK winters don't help either.

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Test before boxing up.

Posted By: hilla311
Date Posted: April 06, 2014 at 10:03 PM

oldspark wrote:

Yes.

Hi old spark, did you cut the speed signal wiring at the speedo and joined in the GPS signal wire?

Posted By: oldspark
Date Posted: April 06, 2014 at 11:43 PM

No. I didn't do it.

Is yours an 8k or 16k speedo?

Posted By: hilla311
Date Posted: April 07, 2014 at 12:02 AM

I'm unsure, the vehicle is a 2012 hiace diesel, how can I determine if its 8k or 16k

Posted By: oldspark
Date Posted: April 07, 2014 at 12:37 PM

Maybe google or a hiace forum.
But as I understand that unit, you'd better find out before you buy.

And I presume you haven't understood how it connects if you are taking about cutting the speed signal wiring - unless I've read the wrong spec.

Posted By: harryharris
Date Posted: April 07, 2014 at 12:40 PM

Yes, no cutting those three leads go to the speedo head, red = 12V+ ign., black = earth and grey = signal.

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Test before boxing up.

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