It's been a while since I've done this. This was Basic Electronics 101 -
what you are looking for is a range switch to convert the gage to read 0 -
15 volts or 0 - 1 volt full-scale. Back in the days of coil-wound analog
gages, you just applied a little Ohm's law & came up with the appropriate
voltage divider to give full-scale deflection at whatever applied voltage
you want and used a switch to select between ranges. I suspect that the new
digital gages have  the divider network in a chip so scaling one may not be
quite so easy. Probably take a little electronics trickery with an op-amp
rather than digging into the guts of a new gage. If you want to build your
own air/fuel ratio bargraph meter with some commonly available RadioShack
parts, look for the tech article on www.pelicanparts.com. Use different
colored LED's in the scale & tell at a glance where you are air/fuel
ratio-wise.

Frank Miller
Manager, SFA/CRM Systems

Alternative Business Systems
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