For selecting a voltmeter, what information should I have before contacting a distributor or sales rep?

1. What range do you need to cover (eg: 10-16 volts)
2. Do you require lighting in the instrument
3. Are you running a 12V or a 24V system (voltage adapters are available)
4. Diameter of the opening the instrument will be mounted in
5. What type of environment will the instrument be used in (eg: highway; high moisture; off-road; stationary equipment; etc)

If you wish to match the style of existing instruments you should also have the following:

1. If your current instruments are a Stewart Warner line, which line (Seaworthy, Heavy Duty Plus, etc) (see the Stewart Warner Products page for the product lines)
2. Bezel color wanted (black, polished, etc)
3. Dial face and graphics (black dial, white numbers, SAE symbols, etc)
4. Pointer type and color (eg: red with black hub)