Aftermarket Tachometer Hookup

Where does the Tach lead go for the SUN Tach my son has for his truck?

Thanks

John

If SUN shows a web address look for their tech help section. They'll probably have it shown there.

I did a google search and couldn't find their web site.

If it does have a web page listed could you please tell me what it is. Thanks! I'd like to include web address like that on a referance page in my web site.