Congratulations on the new van. The GTS dash installation is pretty straight forward as long as you got the gauge wiring harness with the dash. Unplug the old harness and replace it with the GTS harness. Your WB dash will have the oil and possibly temp idiot lights so you will need to install a new temp sender and oil pressure sensor in the engine block for your oil and temp gauges to function correctly. You will also need to run a wire from the coil to the tacho (from memory it's the negative wire but I'm not 100% on that as it's been a lot of years since I did one)