the search at the top will help tons on these two different problems.
on the tach search for cigarette butt and tachometer. on the odometer, just search for SD Odometer.
my tach quit on my SD and I think it is ground issue, cause it is wierd... and an amp did not help.
the odo could be gear or shaft related, not too difficult to take apart. diesel giant's site is good for a nice pictorial on this.
John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!