Does anyone have experience on opening up ASI's and applying rangemarks they could share? Not so much on opening the gauge, but on actually applying the markings where they look right. I've searched HBA, Google, and Youtube and surprisingly couldn't find anything. A/S offers it for an additional $125.00 and my current vendor rangemarks their ASI's (for a specific aircraft) for only a few dollars over the cost of the ASI - but they are always back ordered. This is for a homebuilt, so TSO does not apply here.