Holley EFI 553-133 Instructions

The Holley EFI Fuel Level Gauge is designed to wire directly to the sending unit, allowing it to be used on applications with or without
Holley EFI. It is compatible with any sending units that have a range within 0-300 ohms.
IMPORTANT! Disconnect the battery prior to installation!

WIRING DIAGRAMS:

Figure 1 shows the gauge power, ground, and lighting wiring diagram as well as the sending unit wiring. If there is no fuel sender
ground, connect that wire to a chassis ground.

INSTALLATION:

1. Mount gauge(s) for easy viewing and secure with the included spin lock ring.
2. Install the power, ground, and lighting wires as shown in Figure 1. Harness P/N 553-140 (available separately) allows you to
unplug and discard the pigtails included with each gauge and connect up to 8 gauges together. This configuration makes it easy
when multiple gauges are installed together, allowing the loose power, ground, and lighting wires to only be connected once.
3. Reconnect the battery and follow the calibration instructions below.

Programming:

The fuel level gauge can be manually programmed to any existing fuel tank sender or you can select one of the programmed presets
(Figure 2) – Factory default setting is 240 Ohms Empty and 33 Ohms Full.
While the gauge is powered up, press and hold the button down for 10-12 seconds until the pointer (needle) points at '1/8' tank
1.
then release the button. You are now in programming mode.
FUEL LEVEL GAUGE INSTRUCTIONS
P/N 553-133
Figure 1
Figure 2