street rod gauges?

I've been looking into getting a set of gauges for my toyota pickup but I'm not too sure how to install the speedo. I know I need to buy the electric programmable gauges, but do I have to do anything special for the speedo besides finding the correct signal wire?

I run all Auto Meter stuff, & here's the company I got the electric drive for trans/speedo I got.www.speedometersolutions.com---1-414-463-6661

Thanks. has anyone tried the gps driven speedometers?