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1993 Pontiac Bonneville speedometer

Tiny
THOMPSON001
  • MEMBER
  • 1993 PONTIAC BONNEVILLE
Electrical problem
1993 Pontiac Bonneville 6 cyl Front Wheel Drive Automatic

i have 93 bonneville with dual speedometers. 1 in inst cluster and projection on windshield. Was working fine now 10 mph difference between the 2. Projector shows 10 mph faster than 1 in inst cluster. Inst cluster speedo is accurate. What could cause this and is there a way to reset or recalibrate projector to match inst cluster speedo. Verry irritating and confusing when see wrong speed on window all the time. Can u help?
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Sunday, November 22nd, 2009 AT 12:36 AM

1 Reply

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok first off no reset or calibration for the heads up display module. There is little to no info on this early system. However there is a heads up display control module behind the instrument cluster.
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Tuesday, November 24th, 2009 AT 10:00 AM

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