ChrisTenone:
You'll need some specialized circuitry for the nixie tubes
That would be the Arduinix shield...
ultrasuede:
If anyone could point me in the right direction that would be amazing.
I don't think this qualifies as amazing, but here's a few speedometers that use my NeoGPS library to parse the GPS characters and display the speed:
Of course, there are lots of examples in the library. It's also available from the Arduino IDE Library Manager, under the menu Sketch -> Include Library -> Manage Libraries.
You should also be careful about the serial interface to the GPS:
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Software-wise, use AltSoftSerial if pins 8 & 9 are available. If not, use my NeoSWSerial library. It works on any two pins. There is no reason for you to use SoftwareSerial. It is very inefficient, and it can interfere with other parts of your sketch.
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Electrically, the NEO-6M is a 3.3V device, so you have to shift the 5V levels of the Arduino. A level-shifting module is best, but there are other ways to do it with a few discreet parts. You usually connect 5V to the GPS module's VCC pin, because it has an on-board regulator that converts 5V to 3.3V, to power to the GPS chip. Be sure to verify what voltage the GPS VCC pin needs.
Cheers,
/dev