if its a link gauge which it is, u need the control box, which is about 200, i personally think a big tach like that is super lame and pointless. your stock tach is fine, at most mayeb a shift light.
they are called defi link meter, defi d-gauge is a totally different gauge
http://www.nippon-seiki.co.jp/defishop/product/meter/meter_top.html