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[oilstain]

Can you buy for not a lot of money a 4" GPS speedo that would fit in the OE speedo hole, give spot on readings with any Tyre size/Gearing option 

[Clifford Pope]

GPS is not always spot on. There is a delay in the signal recognition, varying depending on conditions. And of course it takes no account of gradient. I've noticed that at a constant rpm on a straight section of road the indicated speed can sometimes fluctuate by a few mph.

But it is a lot more accurate than a LandRover speedometer:)

[109+1]

Would a GPS speedo not wory about tyre size and gearing. It's measuring ground speed, or have I got that wrong 

[Ian F]

As Clifford indicated, it measures speed across an approximate sphere, if you are going uphill or downhill it will under-read (slightly).  And of course it doesn't work in tunnels.......

Ian F

[Wittsend]

The GPS speedo I have is 3¼" (80 ish mm) in diameter.
Cost around £70, I could find a larger one, off eBay. Maybe they have a bigger one now

I find it deadly accurate, doesn't work in the Dartford tunnel or under dense forest.



 

 

[genocache]

https://www.amazon.com/Speedometer-0-80MPH-Odometer-8-Colors-Backlight/dp/B07TKB7W1K/ref=sr_1_3?keywords=gps+speedometer&qid=1663088218&sr=8-3

You get what you pay for?  Let us know how it goes........

[martinthefirst]

auction: #194270216647

[Craig T]

Having built a kit car in the past, there are a large number of available speedos that run off an electric hall-effect sensor picking up from something that rotates. You could use the propshaft bolts, Handbrake drum nuts etc or you can get a laser cut disc to bolt between the prop and the diff flange. The one I used is in the picture below with a digital odometer.

These gauges are easy to calibrate as you simply need to work out how many times the sensor is "tripped" each mile and dial it into the gauge.
Work out your tyre diameter, find out how many times they rotate per mile, multiply by the diff ratio then multiple by the number of pick up points on your chosen place for the sensor.

Only downside is these gauges usually read quite high, far faster than a Land Rover would go so you would only be using half the gauge.

https://www.smiths-instruments.co.uk/category/classic

Craig.

[Univetsal]

I know it's not what you asked, but the phone app called "digital speedometer - GPS offline odometer HUD Pro" is very good. Allows you to display Google maps with the speed displayed as well when needed (big phone screen is obv's better then!).
As a freebie I cannot fault it, and it's accurate👍

[Alan Drover]

180mph would be an experience in a Series Land Rover!!

[Univetsal]

Sweeps the wrong way too, maybe that's for use beneath the equator... 

[Craig T]

It's a Gauge for a 427 Cobra.

When AC built the car in the UK it was fitted with Smiths gauges. When they were shipped to the US for Carrol Shelby to fit the Ford V8's and 4 speed top-loader transmissions into it, they found the speedo cable drive rotated the wrong way for the UK speedo. They could have fitted a reversing gearbox but they simply asked Smiths to make a gauge that spins the other way.

I didn't need it, I could have fitted a standard clockwise one but I kind of liked the reverse winding version. 

You can get number of gauges that go the right way and not all go up to 180. My one has seen 140mph once which on reflection, was a tad scary........

Craig.