Injector lead:
(generic instructions that should work with most vehicles)
unplug the injector lead(s) from the injector(s)
turn on the ignition but not the starter
select the/an injector plug (with the wires on it).
look for 12 volts on one of the plug leads.
use the lead that does NOT have 12 volts on it as the tap for the injector.
Speed signal(vss):
While tracking fuel consumption is most useful, and cars generally have speed and distance instrumentation already (speedometer/odometer), it is most convenient to identify a signal to use for tracking vehicle distance/speed. Unfortunately there isn't a generic way to do this. You have to locate a schematic for your vehicle and do some guessing and testing, or follow someone elses instructions who has already been there on your particular model. We are looking for a 0-12 volt signal here, and some cars might not even have a speed sensor stock or it may need some conditioning/amplifying before being used with the mpguino.
Ground:
Vehicle ground.
+12:
This should be always on, when the car is off or in run or start, always on. Use a voltmeter on the lead under off/run/start/accy if in doubt.
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VSS y INJECTION LEAD
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