analog input alters voltage... doesn't read properly

pcguru000:
Ah Thank you for this- I did not see Dougs post above and probably would have missed it all together if you didn't mention it.

I am power via the barrel jack HOWEVER I have a 5v regulator inline PRIOR to it- because I thought I'd aim for safer lower voltages (vs the 14.5 the bike throws).

As he said though- this is too little and could be causing strange behavior- I am going to wire in a 9V regulator that I have and see if that fixes it... hopefully that won't run too hot (really don't like it getting hot, at 14.5 volts the 328 chip actually scorched my finger a bit which was surprising.)

I'll post back here once I've tried this again w/ a 9v regulator.

Well, you could just put the output of the "regulated 5V" to the Arduino power header, but I wouldn't want you to biff it.
The 9V via the barrel jack is fine - I guess we'll wait.

Try not and go over 12V input. Even so, the 328 wouldn't get "scorched my finger" hot unless there was something terribly wrong-o.

I don't understand why these would be necessary (is it just a best practice?)"

And, yes, resistors with the LEDs are necessary, because LEDs aren't light bulbs.
I don't understand why people want to fight this.