Technical SW Electric Speedometer

I bought a SW electric speedometer to hook to a late 90's Camero 5 speed tranny. On the tranny there is a kind of a rubber boot and inside it I can see two metal terminals. They look like male spade terminals. When I hook them to the speedo does it matter which is which? What exactaly is inside the tranny that has an output on these two terminals?
Thanks

 

http://www.jalopyjournal.com/forum/threads/electronic-speedo-electronic-sender-unit.821603/

 

Yes, thanks for the directions. I have those directions here. They came with the speedo.
I guess my question was not clear.
On the rear of the tranny there is an electrical connection that has 2 terminals.
What originally hooked to these 2 terminals?
Was it a simple electrical connector?
Or, was it some type of an electronic sending unit?
If it was a simple electrical connector only, that mean the electronic sending unit is inside the tranny, right ?
Thanks

 

What you are looking for is the vehicle speed sensor (VSS). It will have two wire connections and originally the ECM or factory Camaro speedometer connected to it. It is an inductive sensor that picks up pulses off the teeth of a gear on the output shaft. Usually it mounts with a single bolt and is removable.

If you want to test it, connect your two multimeter leads to the two terminals and set the meter to AC volts. It doesn't matter which wire is which. Drive the car, the faster you go the more AC volts generated. When the car is stopped it will read 0 volts.

Just make sure it isn't a neutral safety switch. That won't give you a good speed signal.

 

Take the sensor out of the trans and count the teeth on the gear..If you have more than I think 16, maybe 20 the speedo will need an interface gizmo [somewhere around $$$] as you will never get the speedo to read slow enough..A friend has a trans that has 42 teeth which is almost three times the pluses the SW can handle..I don't remember the gizmo name but I found it in one of the mags, maybe Street Rodder..Set dip switches and came out pretty close, fine tune from there..If you are lucky to have a 42 tooth gear in trans you can remove it from trans and remove teeth leaving every 3rd tooth so you end up with 14 which the SW can handle..

 

The T5 in my '32 has the 42 tooth count and I had the problem of the speedo reading way too high.
Solved it by putting in a universal interface module sold by Dakota Digital between the sensor and the speedo. If memory serves, it was about a $100 unit, but it's worked great for several years now.