Ok, so i built as instructed (I think) but it doesn't seem to be quite right.
It works to some extent, only, it doubles the signal somehow? The tacho reads twice what the engine is doing until it passes 7000 on the dial and drops back to where it actually is. The relay also clicks constantly. So erm, should i get my multimeter out and check the input and output? Or has someone else managed to get the same result and knows what to do? :S
Car in question is an st162, motor is redtop beams with only one serious issue left to resolve (might involve broken ecu, but not sure)
Edit: built as per witzl's external.
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