[fastd]

I have a Smiths speedo gauge part number SN 5321-12 with a calibration number (if that's the right way to call it) of 860.

I'm told that usually ERA speedos use SN 5346-04 with a calibration number of 1000.

I'm told that these speedos can be recalibrated. Measure the number of turns the speedo cable makes over a distance of 59' 9.5" to determine how the speedo is calibrated.

Anyone have any wisdom to share on this topic?