Done it like this and works 1k 0.6w resistor https://www.google.co.uk/search?biw=360&bih=279&tbm=isch&sa=1&ei=AsiwUqe3J4Wx0QWh5IBA&q=tacho+pull+up+resistor&oq=tacho+pull+up+resistor&gs_l=mobile-gws-serp.3...26634.40751.0.42316.31.26.4.1.1.1.582.4710.6j13j4j1j1j1.26.0....0...1c.1j4.32.mobile-gws-serp..17.14.1753.Cy48H2kUVmY#biv=i%7C21%3Bd%7CCEIdNj2NKZoAYM%3A