95.5 ms3x tach output
 

I recently build an ms3x diy and got the car running. The tach output doesn't work though. I can see the tach on my computer but in the car it doesn't move the needle. I have 3 wire coil. Tach out is currently 2i (4i). Ant help would be great, I read online that it might be 1F as output, or that I need to build a circuit, I tried putting the resister in my diag box but I don't think I need that due to my tach running off ECU and not ignition.

Edit::
 

I built the ms3 using the trubokitty.net guide