Speedo corrector gearbox for Ford Sierra

[Declan_Burns]

I posted this recently on the MG website but it could be of interest to others using Ford Sierra gearboxes.


Here’s a photo of the nearly finished prototype of my latest corrector gearbox. It is designed specifically around the Ford Type 9 five speed gearbox which we all know is becoming increasingly popular and not just for our beloved MG T models.
The idea was to make it modular so it consists of four stages as I have indicated on the photo. It attaches to the Sierra gearbox using the standard Ford circlip and comes out at 110°. This reduces the bending radius of the cable as the speedo cable then runs almost parallel to the chassis. I can also adapt the angle at which the corrector stage sits.
The output matches the cable supplied with the Sierra gearbox conversion kits. The bevel stage is actually an adapted cannibalized angle drive for a DIY drill. (Don’t tell anybody!). The corrector stage can be adapted (with limitations) to suit the individual needs. No need to have the speedo re-calibrated.

Regards
Declan
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[panky]

Lovely piece of engineering

[mike.perry]

I would then need to find a dynamo with a rev counter drive and somehow gear the rev counter so that the cable is turning at the same speed into the rev counter as the speedo

[rotgnom]

Hi Declan,
glad to hear from you
Achim