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yes there is a constant power they recommend going directly to battery and one that needs to be switched for the controller. The TPS goes on the side of the IP where the vacuum switch goes. you no longer need the vacuum switch. In fact you no longer need the vacuum pump once you get rid of...

I do not know about tack interface on hummer, The cucv requires a dakata digital ds1 controller to change the alt signal to a usable tach signal. not sure you can do this on a hummer. yes you can start the engine, It just wont shift right without the controller you may have to install a...