These colored bulb covers are
used for backlighting color on black face ISSPRO EV gauges.
These bulb covers are for ISSPRO Enhanced Visibility
EV(1) gauges only. They will not work on EV2, Performax
or the ISSPRO Heavy Duty series gauges.
Make sure you purchase the correct quantity of
covers for your gauges. Some gauges take 2) T-5 bulbs,
and others take 1) T-10.