Diff Speedo Sensor

[MarkyC]

Hi all, Couple of questions
Has anyone used the speedo sensor on the back of the Jag diff, or is there a reason not to.
Would the Dax supplied sensor for the prop shaft be a better bet? I've read in a couple of posts that this sensor doesn't work until your doing around 20mph, would the diff sensor be more accurate?

Thanks
Mark.

[craggle]

Hi Mark

I planned to use the diff sensor in my car but the cables were unfortunately damaged whilst I was moving the diff about the garage.

In the end I made up a plate with a large thread in it to hold a Smiths sensor in the same location as the original sensor. It worked fine and gave good readings but then I decided to change my diff to a lower ratio one.
The new diff didn't have the pick up ring on the crown wheel so I then had to go over to the Tremec sensor which works equally well.

No reason why the Jag sensor won't work though. I also thought of using one of the ABS sensors on the wheels. That should also work quite well.

You might just be able to see it in the photo.

[MarkyC]

Thanks for the reply Craig,
Any idea how i would set the Smiths speedo up with the diff sensor

Cheers
Mark.

[Clive]

Hi Mark,
If you are using a Ford 302 what gearbox are you using? My suggestion would be to use the speedo drive from the gearbox, you should have a lot less bother in the long run.

[MarkyC]

Hi Clive,
It's a Jag Getrag box, I don't think there is a speedo take off

Cheers
Mark.

[craggle]

Do you know how many wires the Jag sensor has?

I have the Jag wiring diagram at home so may be able to see what type of sensor it it.

What type of gauges are you using?

Craig.

[MarkyC]

The car is having the exhausts done at the moment so i can't check, but i think there are two wires on the existing and both are damaged.
I was going to replace it if it was a better, more accurate setup.
The gauges are Dax supplied, Smiths Classic electronic speedo

Mark.