Dantical

Thanks gents, so, I sorted it, I was using an expansion loom to provide tacho out which is 5v's. I used the pull up resistor on the board and used another spare on the expansion loom to increase voltage, so there are two wires from the expansion loom driving the tacho, one is assigned as tacho, the other isn't but works perfectly. Not sure if that's right or wrong, but it works and is accurate.