As you know, I have a 2003 ML350.

I'd like to install the overhead trip computer and found the following different part #'s for the overhead trip computer:

1) A 163 540 64 11 ($265 @ dealer)

2) A 163 540 52 11 ($176 @ dealer)

3) A 163 540 56 11 ($373 @ dealer)

My dealer verified that #3 is the right overhead trip computer for my ML350.

But I found #2 on eBay for much much less but it obviously has a different part # than what my local dealer told me.

#1 came from one of the install documentation that a fellow ML'er found on eBay that was then retrofitted to an ML and it also worked.

My question is:

- What is the difference between all part #'s?

- Will #2 work with my ML?

As always, thanks in advance for your help.

E!

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03 ML350 Inspiration Edition
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