I have exactly the same 3 bar map sensor. It was purchased to be hooked up to a piggy back Apex SAFC instead of the E-Manage.

It has 3 cables; red, white and black.

Just to be on the safe and not to burn the device, Does anybody know which one is signal, voltage and ground?

Its almost obvious that black is ground, but who knows as sometimes I have seen white been used as ground. I have done tons of google and all I get is it is for E-Manage Blue.

Any help would be appreciated.

 

I can confidently say that these are the wiring designations:
Black - Ground
White - Signal
Red - 5v

I have installed a few of these as well as GM 3bar MAP sensors. Do you plan on using it in place of the TPS' input for an S-AFC?