red mark is TDC. 15 degrees BTDC where you want to be is 3 marks after TDC.
The Sensor is located right next to where the transmission meets with the engine under the passenger side floor board.
The Water Temperature Sensor Assembly is located in the thermostat housing. It's explicit location is shown as Ref #15 in the diagram listed in the 'Sources and Related Links' section of this answer. (located below)
Its on the inside fender well 15 before tdc.
The sensor is locate on the hose that connects to the air filter. Big Black hose (Wire is sticking out the hose) It cost $15 dollars at part store.
their are two different speed sensors on that car the input speed sensor which is located inside the transmission and the transmission needs to be removed in order to replace it and the other speed sensor is the output speed sensor which is located directly above the passenger side trans-axle shaft. your input sensor is the sensor which tells the transmission when to shift and the output speed sensor tells the speedometer what it should display and both those parts are fairly cheap they are around 15-25 dollars but just remember if your input speed sensor is bad it is gonna cost you a minimum of 1000 dollars to have a mechanic fix it because of the fact that the transmission needs to be removed.
The cam sensor is located inside the distruberator and is held in place by two 15 torx screws. I just replaced the one in my 1997 Yukon and Auto Zone showed it on the timing cover but they were wrong It is a DR188 wells number
It is located in the rear of the transmission almost in the center. It is held in place by a single 10mm bolt. It is easiest to remove from under the vehicle. I suggest the use of vehicle ramps, you will have enough room to easily remove the sensor. It only took me about 15 minutes to replace and I am far from a mechanic!
15 kills with the silencer =]
You need to buy a new outside temp sensor ($15) It's located between the Radiator and the Bumper of the car (Looking from underneath the car)
code 15 coolant temp sensor low temp indicated change cts sensor or test with multi meter
When you turn on the ignition the service indicator lights up, then press the reset button in the instrument until the mileage resets. This takes around 15 secs so be patient!