Speedometer accuracy... how do you fix it?

[lfot]

So is there a calibration of some sorts for fixing the accuracy issues on 911 speedometers? Yeah, I could mount a GPS unit to the dash, but

[Early_S_Man]

Speedometer Adjustment for tire size?

Speedometer Error. Need some help

Just for the record ... only the electronic speedos for '76 thru '83 models have the trimpot that can be adjusted.

'84 - '89 3.2 Carreras use a different circuit using the ITT UAF2115 IC, and it is calibrated by changing a fixed resistor on the board. Here is a thread dealing with 3.2 Carrera speedos:

Carrera VDO Speedo SUCKS.

[Jeremy Cottrell]

North Hollywood Speedo 818 761-5136

[lfot]

Originally posted by Jeremy Cottrell
North Hollywood Speedo 818 761-5136

Thanks Jeremy. That sounds easier than drilling and such with "itsy bitsy" tools.

I'll look into it when I get my car back from... well... YOU.

[Jeremy Cottrell]

Ha Ha. I can take it over there for you if you like.

[lfot]

Originally posted by Jeremy Cottrell
Ha Ha. I can take it over there for you if you like.

Think perhaps I'll wait until I get the bill for this endeavor.

[Jeremy Cottrell]

We should be finished with the corner balance tonight. I'll give a ring when she is ready and we can discuss the speedo.

[lfot]

WOO HOO!!!