im buying the autometer shift-light (think its called pro-shift lite) that is selfcontained (doesnt need an rpm activater switch. it hooks up to a ground, 12v source, and "electric ignition tach terminal". my question is, on an ls1, do i have and where is my "electric ignition tach terminal"?

it has in perenthesis (MSD, HEI, GM etc)

heres a link to the adobe instructions:
http://store.summitracing.com/instru...m%2D5340%2Epdf

 

On the ECM, white wire, pin #10.

 

thanks