I know that SLP makes an electronic speedometer conversion box to compensate for gear changes, (I'm running a Moser 12 bolt with 4.11 ratio), but I can't find the effin part number. SLP's web site is the worst. BTW seen lots of posts that incorrectly state that a 93 M6 can be corrected via the PCM - this is incorrect. M6 have an electronic speedo that is not routed via chip. Can only be corrected with a converter box - WHICH I CANT FIND?

Thanks.

 

You might also want to consider this item from Dakota Digital . Probably cheaper than anything SLP sells.

 

Fred, as usual you are the man.

 

Do not use the SLP speedo box. It will correct the gear/tire speed, but you will lose or have problem with your cruise control. That's probably why they stop making them. They won't even help me fix it.