tach in a dx?

how do you install a tach in a dx? somone said you just get a gauge cluster from an ex, and there should be a plug behind the dx gauge cluster, but when i took my gauge cluster off, there was no seperate plug for a tach. how do you install one?

This is for an 89, but yours will be similar. http://www.westworld.com/~joe_r/tach/tachinst.html

http://www.automotiveforums.com/vbulletin/showthread.php?t=446700


i wrote that i have a 95 dx...your going to have to buy an external tach