Been doing a little digging this afternoon.

Come across these websites:

DIY Tacho

http://www.massmind.org/images/boards/revbar/index.htm

http://www.t-r-j.com/Auto/Tach/tachometer.htm

DIY AFR Gauge

http://www.scirocco.org/tech/misc/afgauge/af.html

Thankfully enough, I went onto the National Semiconductor website and ordered some samples of the IC chips used in these, should hopefully get accepted.

If I do, I'll make 1 / both up and see if they work!

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09 XT660X:

CCC Stainless Rounds, Stage 1 DNA, Stage 2 DNA, PCV With Custom Autotune Map, PCV AutoTune, Home made O2 eliminator, Self machined Fork Spacers, DIY Autotune Switch.