Auto Meter 6013 - Manual (Page 32)

Chapter 5. Installing the Display System
26 Race Dash Users Guide
Series Resistor Connection
For systems which require series resistor on the ES (Engine
Speed Wire) the resistor must be connected directly to the
terminal to limit interference from the spark plug and coil wires
(which must be the shielded type).
Electronic Ignition or ECU Connection
Connect the ES (Engine Speed) wire directly to the “Tacho”
output of the electronic ignition or ECU. If this results in a Zero
RPM reading with the engine running then …
Some ECU’s (GM LS-1) require a Pull-up resistor connected
between the ES wire & +5v (reference wire). Resistor value of
10,000 Ohms is required.
CB SW
- +
Ignition
System
Resistor
ES (Engine
Speed) Wire
ECU
Tacho o/p
ES
Resistor
10,000 Ohms
+5v