The odometer reading depends on the gear ratio adapter after the 3.55 swap and is not adjustable.
The speedometer needle however is adjustable and can be fine tuned with a movable rotating arm that holds the end of the return spring.
Take off the bezel and it will be obivous.
The reading will never be accurate across it's entire range, so tune it around your mostly driven speeds.
Patrick's gear ratio adapter is dead on accurate, if you use stock tire diameter, which is almost exactly 29".
I got Patrick's adapter with both my rides and they are accurate.
