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450se tachometer into 280s

Started by Claudio, 17 February 2010, 06:11 PM

Claudio

I am aware that this question must have been answered a few thousand times, but i still don't get it:

Can i buy in ebay a whole instrument cluster from a w116 450se to use in my w116 280s?
Will the 8 cyl tacho work in my 6 cyl 110?

Thanks,
Claudio

TJ 450

I think the issue is that the tach runs off the coil input. Of course, a 6 cyl engine fires six time per revolution and so on. As MT stated in another post, the tach would need to be set up to account for this difference.

I have no idea how you would go about doing that, though, as I haven't looked at the circuits of these tachs in detail.

Tim
1976 450SEL 6.9 1432
1969 300SEL 6.3 1394
2003 ML500

oscar

TJ's right.  No idea how one can be converted but basically an 8cylinder tach counts every 8th pulse and a 6 cylinder tach, every 6th pulse.

Further to that, the gearing behind the speedo/odo will be different too I presume.  I've compared a 280 and 350 speedo/odo and that was the case.  So look for a 280 tacho and or a complete 280 instrument cluster.
1973 350SE, my first & fave