1986 SDL Tach reads fast

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1986 SDL Tach reads fast

12-03-2006, 03:37 PM

Mr. G

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Join Date: Nov 2006

Location: Ventura County, So Cal

Posts: 62

1986 SDL Tach reads fast

The tachometer on my "new to me" 1986 300SDL is reading consistently about 60% fast. It indicates 1100 at idle and 5000 at 75 MPH. It is not jerky or intermittent so I am ruling out a loose connection. Is there an adjustable dashpot (or something similar) somewhere in the system? Where does the tach get its signal from? I looked through the FSM but found nothing.

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Later.........Gregg

(86) 300 SDL
(00) GMC Yukon XL 4X4
(97) C5 Corvette
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