Speedometer, odometer and tachometer not working

Tiny
ANTHONY PRICE
  • MEMBER
  • 1994 CHEVROLET 1500
  • 5.7L
  • V8
  • 4WD
  • MANUAL
  • 109,000 MILES
Just bought an 1989 k1500 and the speedometer, odometer and tachometer weren’t and hasn’t worked.
Thursday, August 6th, 2020 AT 12:31 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The speedometer and odometer are controlled by the vehicle speed sensor on the transmission.

In the dash, there is a buffer that changes the signal from the sensor to something the dash can read. This was a common failure back in the day. I attached the location of the buffer for you.

The speed sensor for the transmission is on the output shaft of the transmission. I attached a picture and circled the area where the sensor is located.

Roy
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Thursday, August 6th, 2020 AT 4:55 AM

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