Speedometer Adjustment for 5KTQ?

[Wallace White]

Ben -

My physical speedo also reads +5 mph. I've checked at 30 and at 70. The
trip computer's speed is almost dead on, and the odometer is too. 

I would be interested to know which resistor to adjust... though I'm not
going to pull the instrument cluster just for that.

Thanks,

- Wallace
  '87 5kcstq 173k

"Swann, Benjamin R. (BSWANN)" wrote:
> 
> After comparing speedo with computer, 5 mph seems relatively consistant even
> up to 60.  I haven't had a chance to check higher speeds, but it seems the
> deviation is closer to 5 MPH rather than 10% I originally thought.  Yes it
> has probably been doing this all along.
> 
> I dont know if I want to move the needle, as this would make the speedo
> incorrect at low speeds, yes?  Also, I'm afraid of breaking it or making it
> worse than it was. I can live with 5mph deviation at 60.  At least I know
> how to correct for.
> 
> I wonder if the speedo reading inaccuracy correlates at all with the
> odometer reading.  I'll do some more sampling on a long trip.
> 
> I would be interested in any other information regarding correcting the
> reading, particularly with changing the resistor.
> 
> Thanks for all replies.
> 
> Ben
> '87 5000cstqw