Speedo Pickup Magnets

[Guest mcramsay]

Is it ok to glue 6 equally spaced magnets around a diff output flange or on the driveshaft cv casing for the speedo pick up points?

[theduck]

I have one on my drive shaft as well. Do you have to have 6?

[Guest 2b cruising]

Putting it on a driveshaft will only give true readings in a strait line.

Inner shaft on a corner will always slow down and the outer will speed up.

If used to it that's ok and should get you through IVA.

Same thing as picking up off an abs ring.

[Guest mcramsay]

Just looking for a plan b. I'm going to try and pick up the prop bolts, but space is tight. I couldn't get the speedo to pick up from the abs sensor which is annoying, would have been really simple!

[Guest 2b cruising]

I have not checked for suitability yet but was thinking of putting a clamp able bracket around the nose cone of my diff with a bracket to hold the sensor welded to that.

I would then use a grub screw to lock the clamp and stop it turning on the nose cone.

[Snapperpaul]

I cleaned up the prop flange and used slow setting epoxi to get a good fit

I found less magnets gave a more stable signal at higher speeds

[Guest 2b cruising]

Hi Paul.

Any chance of a picture of your sensor bracket when you get chance.

I asked GBS to fit sensor to prop as changing engine and box, but because I had an mt 75 at that time, they used speedo sensor in that.

Edited October 11, 2015 by 2b cruising

[Guest peter2b2002]

my 4 magnets are on the o/s 1/2 shaft never had any problem with the speedo reading but then I don't go round In circles

peter2b

[Guest mower man]

2 is enough I got some super neo idine ? magnet of the bay about thesize of a 5p piece ,paint off prop adjust to give equal spacing secure with plastic metal job done I used the spares [ came 5 to apack around £2.50] to hold not up behind my lathe mick

[Snapperpaul]

I done have a photo of the bracket

I did find a ready made hole on the fixed frame that supports the diff on the bracket that hold the moving arms of the suspension

I may have drilled a second hole to make 2 mounting points for the bracket

[Graham B]

Only 2 magnets on the prop flange- prop shaft joint.

Drilled two indentations into flange and fitted with seal dire. With more magnets I got an unstable reading. I worked out how msnhpses were needed to cover 1 mile.,( a tape measure and s bit of maths) and set the switches accordingly. GPs speedo app on phone says this is accurate.