L67 Aftermarket Tach Hookup

Howdy,

How can I hookup an aftermarket tach to the tach output on the L67 PCM? Is it just as simple and wire in and go or do I need a converter box or something?

Thanks,

Should be able to, but you would use the white wire on the ign module, not the PCM. There isn't a tach output on the PCM. The PCM doesn't get an actual tach signal you could use, just cam and crank sensor signals that are passed to it through the ign. module.

couldnt you run a signal cable from the alternator... i once heard my dad talkin to his apprentice about this... think its the W terminal that can be found on some alternators - correct me if im wrong