How to add on gauges??

I just pitched the mechanical gauge and went with an electric. I installed mine by making a plate to accept 3 gauges, and a 1 DIN radio. My original radio space was already hacked up from the previous owner trying to install a tape deck in the dash. Some day I want to make a new plate and actually weld/blend it in to the dash for a factory look. I have VDO Oil, Volt, and Temp gauges.