Good catch!

Another thing:

Do you (fusto) know how much current the input this is connected to draws?
Max current rating shouldn't be a problem, but the minimum (for good regulation) might be...
Worst case requires 10mA (typical 3.5mA) To be safe you might want to put a resistor between the output and ground, so that ~5 mA always flow (ie 1kOhm resistor). To cover the worst case, use a 520 Ohm resistor instead.

To increase stability and transient response (don't know how sensitive the MAP input is to small fast changes) you might also want to add a 0.1uF cap on the input and a 10uF on the output (both to ground).

Spec sheet and application notes for the LM317.

Edit: In your parts listing you say subminiture LED lamp. Is that a LED with its own resistor, so that you can drive it, as bought, direct from 12V? If so, skip the 1kOhm resistor for the LED in the drawing - it's only required if you had a raw LED.


/Michael