Thanks guys and yes Mike, your link was exactly what I was talking about. I spent a good deal of internet time searching for prices and other types. Alan, I found the one like you mentioned but it was only for a specific DeWalt model. I didn't fine a frame mounted one anywhere else.
I ended up buying the one from Rockler because it says it can be used on most saw brands and I read a review on Amazon regarding that one and a Bosch owner had it and loved it. For $ 21 I'll take a chance.
I have to say that I am not very happy about needing the saw to be running for it to come on and then reset my work to it.:icon_scra We'll see and I'll review it here after i install and use it.
I appreciate the input.