One old style (red LED, no video) G-Tech
One 9V battery clip
One 1Kohm resistor
Remove plug from cig lighter cable. Open case. Detach
red wire of cig cable from its solder land. Attach red
battery clip lead to this instead. Attach black battery
lead to ground land (white wire, leave it too). Attach
red cig cable wire to a 1K resistor, other end of resistor
solder against Pin 12 of the ADXL105 chip. That's third
pin from the top with the blue capacitors to the right.
You need a fine soldering tip, 50 mil pitch leads.
Now your cig lighter cable has white wire = ground, red
is 0.5V - 4.5V output for -1G - +1G and you still have
the digital readout. Ready for prime time. Tin the ends
and screw 'em down to your MPVI plug.
If you have the old style G-Tech laying around this is
as close to a freebie as you can get. Took me about
10 minutes (not including reading the datasheet for
the part I found inside).