# Pressure gauge with analog output [closed]

I have a circuit that needs to electrically output a pressure value and display it using analog dial gauge. First I wanted to use regular round ammeters but they don't look like "real" pressure gaugeish. Have a look to get an idea about what I mean

Needle in a pressure gauges is usually mounted in the center and have a much more wider travel sector. The best I can think of is to get an auto tachometer, print a new dial face with pressure scale and remove all unnecessary control electronics from the tachometer leaving only galvanometer and a precision resistor inside. Then I plan to drive it with PWM. There is another type of tacho that uses a small stepper inside. This should be also fairly simple to drive.

I don't want to reinvent the wheel, so want to ask if anybody knows about a product that does exactly same job, i.e. pressure gauge simulator?

While there are fairly wide angle moving coil meters, to get to 270 degrees you probably need either a stepping motor type (with some provision for homing the pointer since steppers are increment not absolute positioning devices) or an air core movement. The latter have to be driven in quadrature (2 coils driven with currents x and y representing sin and cos), the the resulting pointer angle $\theta =tan^{-1}(x/y)$.