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You do not need a potentiometer to set an idle higher than the default 1,200 RPM in SEIC mode, you only need a resistor, available from Radio Shack and others. A potentiometer allows you to adjust the SEIC idle speed to whatever you want at the time, useful if you're actually running a PTO.
If you only want a fixed RPM other than the default 1,200 RPM there is a resistor ohm value to RPM chart in the 2009 Body Builders Layout Book (pg 342) that will let you select the resistor value to set the RPM you want. Pg 343 has the wiring diagram showing the selected resistor connected between PTO_VREF (white/brown) and PTO_RPM (green) for fixed RPM use.
Per the poorly formatted copy of the chart below, a 22K ohm resistor will set 1,320 RPM.
Diesel Engine
Engine Target
Speed (RPM)
Resistor
(Ohms)
(5%, 1/4 Watt)
Voltage (volts)
(± 0.0875 v)
680 (Base)
1200 Open Circuit
1200 43K
1260 27K 0.6875
1320 22K 0.8875
1380 16K 1.0875
1440 13K 1.2875
1500 11K 1.4875
1560 9K 1.6875
1620 7.5K 1.8875
1680 6.2K 2.0875
1740 5.6K 2.2875
1800 4.7K 2.4875
1860 3.9K 2.6875
1920 3.3K 2.8875
1980 2.7K 3.0875
2040 2.4K 3.2875
2100 2.0K 3.4875
2160 1.6K 3.6875
2220 1.3K 3.8875
2280 1.0K 4.0875
2340 750 4.2875
2400 510 4.4875
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