im atempting to install a 2000 ls1 casmaro cluster into a 87 iroc. So far all i can get to work is the illumination and voltmeter. Since i got the wire harness i found out that the LS1 cluster gets tach, fuel level, and collant temp from the class 2 seial data comming from the ls1 pcm and i think the digital odometer gets voltage from the vss, which i dont have yet. Does anyone know if there is a way to hook it up and make it functional, aside from the 4-cylinder tach signal and the differnt signal from the fuel level sender, i already know about that.