Do all the injectors 'pulse' at the same time or one at a time?  

What is the best way to 'wire in' new injector connectors? I picked up new
ones from Courtesy Nissan but the harness had only two pins for each side
of 3 injectors...  my old one has a connector with four pins for each
side. It looks like I'll have to cut off each new connector & connect it
to the old wires for that injector.  If so,

What is the best way to make a good long lasting connection?
How to make a new 'boot' for the new connector? etc...

Also, I've tested my old injectors for ohms (12.1) for each & for spray
(even pattern & very narrow cone shape).  I had trouble measuring the ohms
due to what looked like a 'mineral deposit' that fully coated each of the
injector pins.  This was preventing my voltmeter leads from making good
contact (and possibly my injector connectors). It took about 30 minutes to
scrape all the pins to get down to the metal.  

How can this type of deposit be prevented?  Is it likely that all the
connectors in the engine have this type of deposit?  Since the 'female'
side of the connector can't be easily scraped what is the best way to make
sure all the connectors are clean & making good contact? We don't use salt
on the roads here in Texas & if this is a common problem with older cars
hopefully there is a way to reduce/prevent this from happening.

Is there a really good contact cleaner spray?

Has anyone connected a 'scope' to each injector to look at the signal put
out by the computer?  If so & if the connector is not connected to the
injector is it a good 'square edged' signal?  Could the scope be a good
way to check for a failing injector?  

Thanks... just trying to find better ways to fix & prevent problems.