How do you install a Sunpro super tach 2 tachometer in a 1979 Chevy Silverado?

If the wires are Red,Black,Green,and White I can help you. Im also assuming you have HEI ignition. The red wire will go on the positive battery terminal, make sure you run an in line fuse. The white and black wire are for the light, so you will have to tap in to a dash light. White being positive. The green wire will go on the tach lead also known as negative. The cap has the words TACH and BAT on them. Hook it up to the TACH.