The two plugs for the dash on a 4000. 1 is for the trans. temp gauge hole if the dash was on a 4020. The other plug is for the tach dial hole a 4020 has a dial to set for the gear you run in and shows MPH On a 4000 the needle of the tach is centered 1 side shows RPM the bottom side shows Mph with all 8 gears on the face of the tach.
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