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Easy to install. depending on the year of the car you might have an extra connection for power at your fuse box.
You have 2 choices for the RPM measurement. You can go outside the car to the PCM which I did. This is not hard, but more work.
You can tap into the one that goes into your instrument panel. The problem with this there are 3 white wires and you will have to guess which one is correct.
Get yourself one of those wire tapping things which will make your life easier.
If oyu go outside your car you will need to buy additional wire.