im getting my car dyno tuned on the 27th and i have a question. im getting it tuned on all motor, then nitrous. my tuner said i could use neptune to switch maps from motor to nitrous. the car is a 91 civic hatch with built b18a1 converted to obd1. the tuner said i have to hook up a toggle switch so when it is flipped it will switch maps. can anyone help me on what to do?

 

The switch has two pins. If you're using a grounded input (You should), one goes to ground, the other goes to the ECU pin you want to use as an input.

 

so the plain toggle switch i have with the two prongs on back, one gets grounded and one runs to whatever i hook it up to? my tuner said something about the vtec pressure switch wire. so i would connect that wire coming off my jumper harness, to the other prong of the switch.

 

You can connect it to:

B5 (AC Switch)
B8 (Power Steering Pressure)
D6 (VTEC Pressure Switch)
D4 (Service Connector)
D2 (Brake Switch)
B9 (Starter Signal)

 

B5 (AC Switch)
B8 (Power Steering Pressure)
D6 (VTEC Pressure Switch)
D4 (Service Connector)

These are all grounded inputs.