I just found this in the manual also: Particuarly "If the TPS input is not used, this wire should be connected to sensor ground"
Throttle position sensor
The throttle position sensors used on most cars are potentiometer or variable resistance types, which put out a
voltage that increases as the throttle opens. The easiest way to check a TPS is to unplug it and put an ohmmeter
on its pins. Observe the resistance as the throttle opens and closes. Each pair of pins will behave differently:
The resistance between the VREF and ground pins will remain constant. The resistance between the ground
and signal pins will be low with the throttle closed and high with the throttle wide open. The resistance between
the VREF and signal pins will be high with the throttle closed and low with the throttle wide open.
If your sensor behaves like this, it will be pretty straightforward to connect it to the MS3Pro.
If the resistance jumps from infinite (or near infinite) to near zero, you have a switch type throttle position sensor,
or possibly a seriously defective potentiometer type TPS. These do not provide very much information that MS3Pro
needs, as it can tell if you are at idle or full throttle by the MAP sensor information. You can still use MAP based
acceleration enrichment. If the TPS input is not used, this wire should be connected to sensor ground.
)
