When you modify your gearbox, diff ratio or change to a large circumference tyre, it will often result in an inaccurate speedometer. This 12V module alters the speedometer signal up or down from 0% to 99% of the original signal. With this improved model, the input setup selection can be automatically selected and it also features an LED indicator to show when the input signal is being received.
Supports pulse input & does not work with sine or square wave signals.
Speedo Corrector Module for Cars
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It doesn't work as advertised. I'm disappointed that Jaycar sell this. The internet is littered with reports of people unable to make it work - I spent hours trying to figure out the problem, and gave up. By the time I gave up I had modified the product in an effort to make it work, so returning it would be a waste of time.