For '83 and earlier the gauge in the cluster merely reads the signal send by the tachometer amplifier. In my '85 300SD car the tach gauge was totally unresponsive and could only be fixed by replacing the dash unit (clock/tach gauge).
On Mon, May 1, 2023 at 12:40 PM Allan Streib via Mercedes < mercedes@okiebenz.com> wrote: > In my cars (W123 and W116 OM617 diesels), the dashboard gauge works, it's > the amplifier that's flakey. > > On Mon, May 1, 2023, at 10:45, Andrew Strasfogel via Mercedes wrote: > > My '85 arrived with a dead tachometer. I was able to purchase the last > > tachometer/clock gauge in the USA from the Classic Center. They are > > discontinued. The '84-85 models do not have a tach amp. > > > > On Mon, May 1, 2023 at 11:35 AM Jim Cathey via Mercedes < > > mercedes@okiebenz.com> wrote: > > > >> IIRC, the (tach amplifier) circuit is right out of the application notes > >> for the main IC used in the thing. > >> > >> -- Jim > >> > >> > >> _______________________________________ > >> http://www.okiebenz.com > >> > >> To search list archives http://www.okiebenz.com/archive/ > >> > >> To Unsubscribe or change delivery options go to: > >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > >> > >> > > _______________________________________ > > http://www.okiebenz.com > > > > To search list archives http://www.okiebenz.com/archive/ > > > > To Unsubscribe or change delivery options go to: > > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
