At what pressure does the engine oil pressure switch open?

The diagram states the oil pressure switch "opens with oil pressure above 6 psi."

What wire color carries the tachometer signal from the ignition coil and distributor?

Circuit 731 GN (green) carries the tachometer signal, with 751 GN running to the ignition coil and PCM; the tachometer line uses a tachometer signal shield near connector C249M.

Which connectors differ between the 2.0L automatic and the 2.5L engine?

The diagram marks C168M and C151F as "2.0L AUTOMATIC ONLY" (*) and C151M and C167F as 2.5L (**).

How does the integral generator/regulator work according to this diagram?

It keeps the battery charged and powers the vehicle's electrical system; output varies with rotor speed and rotor winding current, which is controlled by the built-in regulator. The stator's alternating current is passed through rectifier diodes and converted to direct current.

What wire colors feed the oil pressure gauge circuit?

Circuit 110 P/Y at connector C249 and 110 P/V down through C1000 to the engine oil pressure switch, which grounds at G105.

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1996 Ford Probe Instrument Cluster Wiring Diagram - Tach, Oil Gauge, Alternator

Tachometer and oil pressure gauge circuit wiring diagram with color-coded wires

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Reference · 1993-1997 ProbeAll 65 wiring diagrams

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Wiring diagram of the tachometer and engine oil pressure gauge circuits with color-coded wires and connectors.

Part of 1993-1997 Ford Probe Wiring Diagrams

AI caption December 2012 · Photo 493 of 676

This scanned wiring diagram covers the instrument cluster circuits for a Ford Probe, specifically the tachometer, engine oil pressure gauge, ignition coil, distributor, powertrain control module (PCM), and integral generator/regulator (alternator) circuits. It shows the 731 GN and 751 GN tachometer signal wires running from the ignition coil (page 21-2), PCM (page 13-7), and distributor (page 21-3) through connectors C171, C246, C170, C210F, C249F and C249M (with a tachometer signal shield) into the instrument cluster tachometer. Applications are split between 2.0L and 2.5L engines, with connector variations noted for 2.0L automatic only (C168M/C151F) versus 2.5L (C151M/C167F). The oil pressure gauge circuit runs on a P/Y and P/V wire through C249, C1000 and the engine oil pressure switch (which opens with oil pressure above 6 psi) to ground G105. The charging circuit uses 20 W/BK wires through C206M/C206F and C149F/C146M to the integral generator/regulator (page 12-1), with an explanatory note describing how the alternator's built-in regulator controls rotor winding current and rectifies stator AC output to DC. Ground references include G208 (page 10-8) and grounds on pages 10-4/10-5.

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Frequently asked questions

At what pressure does the engine oil pressure switch open?: The diagram states the oil pressure switch "opens with oil pressure above 6 psi."
What wire color carries the tachometer signal from the ignition coil and distributor?: Circuit 731 GN (green) carries the tachometer signal, with 751 GN running to the ignition coil and PCM; the tachometer line uses a tachometer signal shield near connector C249M.
Which connectors differ between the 2.0L automatic and the 2.5L engine?: The diagram marks C168M and C151F as "2.0L AUTOMATIC ONLY" (*) and C151M and C167F as 2.5L (**).
How does the integral generator/regulator work according to this diagram?: It keeps the battery charged and powers the vehicle's electrical system; output varies with rotor speed and rotor winding current, which is controlled by the built-in regulator. The stator's alternating current is passed through rectifier diodes and converted to direct current.
What wire colors feed the oil pressure gauge circuit?: Circuit 110 P/Y at connector C249 and 110 P/V down through C1000 to the engine oil pressure switch, which grounds at G105.