hello i have a 1987 chevy r10 silverado with a 5.7 tbi in it and id like to put the 5.7 tpi in it i got out of an 88 formula firebird. i have the complete engine and transmission and computer and wiring harness. i have already installed the 700r4 from the firebird into the truck. i got a gauge cluster from a 91 suburban with the electronic speedo. im trying to figure out what to run the wires from the speed sensor on the tranny to the wires are yellow and purple. i also have the yellow buffer box from the firebird. im just starting on trying to get the speedo and gauges working correctly before i pull the motor to swap it. any help would be appriciated.