Would it be possible to make the HKS Turbo Timer Type-0 glow in blue? Or match the gauge cluster?

 

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I don't think you can change readouts like that unless you crack them open and switchout the bulb. I'd be hesitant to do that.
Dunno if you could put a thin peice of tape over the front?

I had either the Type 0 or Type 1 from HKS; and it was a blue readout. I liked it a lot actualy, showed the 0-60 and 1/4 mile times, speed and rpm as well as max for each.