I bought my first skyline a few weeks ago and its tacho wasnt working. I took apart the whole dash the other day and can now see that behind where the tacho is, there is 3 wires that appear to have been displaced from their proper position. A green, black and red. Does anyone know where these are meant to lead? Each is about 15cm long. The tacho, when driving, starts at about 1000rpm when the car starts and then rises at about 250-500 rpm a minute. It resets to 0 when the car is off. Thanks for anything you can add.