The electronics can be really simple if you either have the stock LS3 wiring harness modified by a company like Speartech or buy a complete aftermarket wire harness. It only becomes more complex if you have a more modern car with control modules that must interface with the LS3 ECU.
If not, there are only five connections: B+, ignition, ground, fuel pump (the relay is included in the harness), and cooling fan control (there’s actually two: primary and secondary). You also get outputs for tach, speedo, a/c, tap shift, and shift indicator. Those are all optional. I took advantage of the electronic speedo and tach signals to install an aftermarket (autometer) programmable combination gauge. Works great!
