After that the vacuum line, I have another pipe added to the intake plenum but you can put a "T" on the vacuum line going to the cruise control, the other one goes to the carbon canister and there is a switch that switches on and off which would produce pulses in your signal.
And provides a nice image:
http://www.mx5unleashed.com/1-pix-mx5/t ... G_9800.jpg
Attached is a pic from under my hood. Obviously I don't have the extra pipe, so should I 'T' off the line that is there (1), or can I hook directly to the plugged line (2)?