From their Tech Support
Sorry for all the troubles we are having here. We got the tacho back. It has blown the internal fuse again. Unfortunately it appears to have got some heat into it before it went. I have attached a picture of the board. When we went to replace the fuse the part on the circuit board it solders to came off, form the heat. Unfortunately there is no repair for this. I the picture this is the area in front of the harness plug right side.
As far as the gauge we sent that somebody stole from you mail. Not sure what to do there as cant really blame you for that.