Kussmaul Electronics 091-84-004 - Manual (Page 10)

Bracket to support switch
Linkage to transmission
Transmission
Switch used to sense when vehicle
is in park. This is a momentary
switch that connects a ground
to pin 4 on the Engine Idler
Vehicle shown in park
To pin 4 Engine Idler
Ground
For vehicles that do not have a Neutral Safety Switch
or have a digital switch that does not connect to ground .
Instructions
Find a suitable momentary switch preferably watertight.
Construct a bracket to mount the switch to the transmission. Use the oil
pan to mount the bracket.
Align the switch so when the vehicle is in park the switch will make a
ground connection.
Figure 5