Factory tach and MSD 6-series boxes?

[Hit Man X]

My 280S is sans tach, I picked up a factory 280SE tach cluster a while back. Anyone happen to know if I can drive the factory tach off the 6-series tach output on the box?

If not, how possible would it be to use a factory style setup with the crank trigger and tach amp (like found in the Diesel cars)?

[cth350]

The tach needs to divide by the number of cylinders per rev if it's electrical. You could, in theory, multiply the pulse train for a straight 6 to drive a v8 tach (that's a 280se 3.5 tach?) by 8/6 with a little circuitry. That or find one of the tachs that was installed in the 250E or 250CE in europe. A rare thing. -CTH

[Hit Man X]

The tach I have is for the M110/I6 car, at least I believe so due to the 6500rpm redline.

[alabbasi]

Originally Posted by cth350

The tach needs to divide by the number of cylinders per rev if it's electrical. You could, in theory, multiply the pulse train for a straight 6 to drive a v8 tach (that's a 280se 3.5 tach?) by 8/6 with a little circuitry. That or find one of the tachs that was installed in the 250E or 250CE in europe. A rare thing. -CTH

I think the 280S in question is a W116 model car and not a W108.