S15 speedo doesn't work

i have an s15 engine in my 240 but my speedometer doesn't work. I know the speed sensor is in the differential, which i have, but i don't know what to hook it up to. Some help would be greatly appreciated.

Gabe

get under your car and start checking all the wiring and sensors on your trans and diff.<the good part about your speedo being out is the speed sensor on your car dosent know how fast you are going and wont kick your speed down when you get to 115mph>anyway get under there and start checkin

oh you have an sr20det i didnt notice thet when i 1st posted....cant help u

I am having the same problem, if anyone can point me in the right direction i would be reallly greatful.

I am managing to get a signal but its about 20x faster than it should be.
at 5mph it reads at 80mph+


thanks

http://www.dakotadigital.com/Detail.cfm/-/Category=122/PartNumber=SGI-5/product.htm

you need this

Thanks!!!!!