Tach and transmission issues

tmarked1tmarked1 Member Posts: 1
edited September 2016 in Ford
I have an F-250 7.3 Desiel automatic with a non-working tach.
The sensor has been changed with no result.
I'm also having issues with the transmission not dropping into low gear by itself.
I have to manually put into low gear to start out then shift myself. All fuses are good.
Any suggestions???
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