you can try disconnecting your PP guage, see if that makes a diff. Theres an article floating around here somewhere that says you can move the power for the PP from the tach to another location and youll get better voltage. I did it and i got another volt of power at my dash. you can also disconnect the 2 wire connection at the motor for the PP. there's only one 2 wire harness back there, near the servo motor.