What are the fuel gauge sender resistance values?

The fuel gauge sender/electric fuel pump reads 145 ohms when full and 22.5 ohms when empty.

What resistance should the coolant temperature sender show?

74 ohms cold and 9.7 ohms hot, on circuit 39 (R/W).

What wire circuit does the Bronco fuel gauge use to the sender?

On Bronco only, the fuel gauge wire changes from 29 Y/W at C202 to circuit 673 DB/Y through connector C134 to the fuel gauge sender/electric fuel pump.

How does the oil pressure gauge circuit work?

The oil pressure gauge includes a 20 ohm resistor and connects via circuit 31 (W/R) through C202 and C101 to the oil pressure switch, which is closed with normal oil pressure.

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1990 Ford Bronco Instrument Cluster Wiring Diagram 60-2 (Gas, No Tachometer)

Ford instrument cluster wiring diagram 60-2, gas without tachometer, fuel/temp/oil/voltmeter gauges

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Instrument cluster wiring (60-2, gas without tach) showing fuel, coolant temp, oil pressure gauges and voltmeter fed by fuse 18 via 640 R/Y; lists fuel sender 145 ohms full / 22.5 ohms empty.

AI caption June 2012 · Photo 1415 of 1799

This document is page 60-2 of a Ford electrical/vacuum troubleshooting manual, showing the instrument cluster wiring diagram for gas engine vehicles without a tachometer. Power comes from fuse 18 (15A) in the fuse panel, hot in Start or Run, feeding circuit 640 R/Y through splice S215 into cluster connectors C250 (pin 13) and C251 (pin 5). The diagram covers four gauges: fuel gauge, coolant temperature gauge, oil pressure gauge (with an internal 20 ohm resistor), and volt meter. The fuel gauge circuit (29 Y/W) shows single-tank and dual-tank variants, with F-Series-only and Bronco-only branches (Bronco uses circuit 673 DB/Y through C134) leading to the fuel gauge sender/electric fuel pump, rated 145 ohms full and 22.5 ohms empty. The coolant temperature circuit (39 R/W) runs through C202, C101, and C125 (4.9L only) to the sender, rated 74 ohms cold and 9.7 ohms hot. The oil pressure circuit (31 W/R) leads to the oil pressure switch, closed with normal oil pressure. Grounds use circuit 57 BK through splices S103, S200, S202 to grounds G100 and G201, with cross-references to grounds pages 10-1 through 10-12, charge/power distribution page 12-7, and fuel tank selector page 49-2.

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Frequently asked questions

What fuse powers the instrument cluster gauges in this diagram?: Fuse 18, a 15A fuse in the fuse panel, hot in Start or Run, feeding circuit 640 (R/Y) through splice S215 to cluster connectors C250 and C251.
What are the fuel gauge sender resistance values?: The fuel gauge sender/electric fuel pump reads 145 ohms when full and 22.5 ohms when empty.
What resistance should the coolant temperature sender show?: 74 ohms cold and 9.7 ohms hot, on circuit 39 (R/W).
What wire circuit does the Bronco fuel gauge use to the sender?: On Bronco only, the fuel gauge wire changes from 29 Y/W at C202 to circuit 673 DB/Y through connector C134 to the fuel gauge sender/electric fuel pump.
How does the oil pressure gauge circuit work?: The oil pressure gauge includes a 20 ohm resistor and connects via circuit 31 (W/R) through C202 and C101 to the oil pressure switch, which is closed with normal oil pressure.