when my tachometer quits working, why does my auto trans quit shifting right? It is a 7.3 diesel non turboed

1993 FORD F-350
165,000 MILES
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KDC1806
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When my tachometer quits working, my transmission (auto trans) quits shifting right. I know its something electrical, but where do I start looking?
Nov 20, 2011 at 7:14 PM
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FIXITMR
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no CEL?
Nov 20, 2011 at 7:20 PM
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FIXITMR
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you could check/replace the tach sensor.
Nov 20, 2011 at 7:31 PM
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KDC1806
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where is the tach sensor located at?
Nov 20, 2011 at 9:43 PM
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FIXITMR
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on the injection pump gear cover.
Nov 21, 2011 at 7:48 PM