So I bought a cheap chinese bluetooth dongle OBD2 thing for my phone. It did not have an option for a pontiac so I put in chevrolet. Anyway, it seems to work. Gives RPM's, mileage, coolant temp, and a bunch of other stuff. All seems normal. Says the coolant temp is 195 at normal operating temp and 202 in traffic (this is just below half way on the gauge in the car. Made me feel better. But it says the voltage is 13.7-13.8 and the gauge in the car said 14.7-15.2 volts. Any thoughts on which is right or why there is a difference?
