Electronic Speedo

[lockyer89]

If not the gearbox, where does an electronic speedo pick up its speed pulse from?

[knights_templar]

sensor on the drive train, usually the diff pinion flange

[Longboarder]

Both the type 9 and MT75 come in a version with an electronic sensor (Hall effect). These can be retrofitted to a mechanical/cable output box to convert it. MT75 senders are on ebay. Type 9 ones are rare as hens teeth.

 

Nigel

[Guest mower man]

Magnet s on prop or drive shaft [prop on mine ] works well but get good magnets! mower man

[cb750]

My speedo sensor (smiths) picks up the heads of the diff bolts as they pass it. It doesn't need magnets to work but some sensors do need to use magnets. You can buy an electronic speedo sensor adaptor for the type 9 from Burton Power for £15 but then need the Ford speedo sensor which they sell for £40. I had both but my new gearbox didn't have any speedo drive gear on the mainshaft so couldn't use them!!

[Guest iank]

The hall effect sensor doesn't need any magnets , it just needs to be close to a ferric object that will pass within a coupe of millimeters of the sensor.

Mine is mounted just above the diff flange and picks up the 'pulses' from the bolt heads that pass underneath the sensor. So 4 bolts heads = 4 pulses per revolution.

[Guest snowy2]

my car had a single magnet on the rear of the brake disc and a reed switch sensor......the car did over 22000 miles with out problems.

[Guest whiz]

mines is a pain in the arse sensor. not heard of that type before I bet , picks up on the four bolts on the diff but sometimes the harder you go the sensor fails to pick all the time so you get a wonky speedo reading, pain in the arse to get into to fine adjust.

whiz

[lockyer89]

Thanks for the replies. I think I've spotted a couple of magnets glued to the prop shaft flange, so I'll investigate today. Weather like today only makes me want the car ready sooner!!