i have an 87 rx7 na, with maybe 25k on the rebuild. problems are:

altenator goes out 2 or 3 times a year.
questions what does the big guaged wire go to from the altenator. does it go to the starter. or what. also my electric windows is a strong pull on it and so is the brakes when i stop. everything drains it except my radio. lights and heat and brakes causes the volts to drop.

how bad is it to run with no O 2 sensor.

i tore down my engine and while doing so i found a oil line from my omp not hooked up. how bad is that on my engine.

while tearing it down i took out my actuators all the way out. and blocked them off.