What fuse powers the instrument cluster on the gas-with-tachometer setup?

Fuse 18, a 15A fuse in the fuse panel (pages 12-3, 12-5, 12-7), hot in start or run, feeding circuit 640 R/Y through splice S215 to connectors C251 and C250.

What are the resistance values for the fuel gauge sender?

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

How does the oil pressure switch operate in this circuit?

The oil pressure switch is closed with normal oil pressure and connects to the cluster via circuit 31 W/R through connector C101, working with a 20-ohm resistor at the oil pressure gauge.

What wire feeds the tachometer signal?

The tachometer connects via circuit 11 DG/Y through C202 to circuit 648 R/LB from the start/ignition system (page 20-5); its other lead uses circuit 398 BK/Y, which is not used on the 4.9L but applies to 5.0L, 5.8L and 7.5L engines.

Home/ Registry/ Ford/ Bronco/ 1987-1991/ “Eddie Bauer”/ Photo supermotors.net/registry/media/928136

1990 Ford Bronco Instrument Cluster Wiring Diagram 60-1 - Gas with Tachometer

Instrument cluster wiring diagram, gas with tachometer, showing gauges, senders and color codes

‹ ›

Instrument cluster wiring diagram for gas-with-tachometer clusters showing fuel, temperature, oil pressure gauges, senders and color-coded circuits.

AI caption June 2012 · Photo 1414 of 1799

This document is page 60-1 of a Ford factory wiring diagram set, showing the Instrument Cluster circuit for gas engines equipped with a tachometer. Power enters the cluster from fuse 18 (15A) in the fuse panel, hot in start or run, via circuit 640 R/Y through splice S215 and connectors C251 (pin 5) and C250 (pin 13). The cluster contains the engine warning indicator and module, fuel gauge, coolant temperature gauge, oil pressure gauge (with a 20-ohm resistor), tachometer, and volt meter. The fuel gauge circuit (29 Y/W) branches for single tank and dual tank configurations, with F-Series and Bronco-specific connectors (C206, C202), leading through circuit 673 DB/Y to the fuel gauge sender/electric fuel pump (145 ohms full, 22.5 ohms empty). The coolant temperature sender reads 74 ohms cold and 9.7 ohms hot on circuit 39 R/W. The oil pressure switch (closed with normal oil pressure) connects via circuit 31 W/R. The tachometer receives signal on circuit 648 R/LB from start/ignition and uses circuit 398 BK/Y for 5.0L, 5.8L and 7.5L engines (not used on 4.9L). Grounds shown include G100, G201, S103, and S200, with cross-references to grounds pages 10-1 through 10-11 and related pages 12-3/12-5/12-7, 20-5, and 49-2.

Is this accurate? Sign in to help verify it.

Frequently asked questions

What fuse powers the instrument cluster on the gas-with-tachometer setup?: Fuse 18, a 15A fuse in the fuse panel (pages 12-3, 12-5, 12-7), hot in start or run, feeding circuit 640 R/Y through splice S215 to connectors C251 and C250.
What are the resistance values for the fuel gauge sender?: The fuel gauge sender/electric fuel pump reads 145 ohms full and 22.5 ohms empty.
What resistance should the coolant temperature sender show?: 74 ohms cold and 9.7 ohms hot, on circuit 39 R/W.
How does the oil pressure switch operate in this circuit?: The oil pressure switch is closed with normal oil pressure and connects to the cluster via circuit 31 W/R through connector C101, working with a 20-ohm resistor at the oil pressure gauge.
What wire feeds the tachometer signal?: The tachometer connects via circuit 11 DG/Y through C202 to circuit 648 R/LB from the start/ignition system (page 20-5); its other lead uses circuit 398 BK/Y, which is not used on the 4.9L but applies to 5.0L, 5.8L and 7.5L engines.