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Scott,

I am in the process of adding an oil pressure gauge to my MkII. I discovered that while the OP sender is there and has a wire connected to it from the engine's wiring harness, the wire doesn't go to the pedestal.

On my boat, I found the wire in the engine wiring harness was cut back and taped near the engine wiring terminal strip. On my boat the engine wiring terminal strip is mounted on the starboard side of the engine compartment up high above the air cleaner on the engine.

The wire from the OP sender is yel/blk. Unfortunately, the red wire from the engine harness also powers the circuitry in the pedestal in addition to the voltmeter so using that wire as the OP sender wire wouldn't work. IMHO, I've determined that I need a separate wire for the OP sender/gauge combo. You could use the voltmeter hole for the oil pressure gauge though.

My effort to add an oil pressure gauge is stalled waiting for me to find time to run the additional wire.

Hope that helps,

Norm,

No I haven't actually wired it up even temporarily. I am still trying to determine the ohmic value of the sender on the engine. There are 2 standard marine sender values: 33-240 ohms (USA standard) and 10 - 180 ohms (Euro standard). The sender on the engine measures about 100 ohms with the engine off & about 50 ohms running at idle. My guess is that the sender is either Yanmar proprietary or the Euro sender.

The gauges in the engine panel are made by Teleflex-Morse. The matching gauges are Teleflex oil pressure gauge p/n 84180 (for 33-240 ohm senders) or p/n 61766 for 10-180 ohm senders. I am going to buy a 61766 and give it a try.

The gauge has 3 connections, ground, +12VDC, and sender. There are also connections for lighting.

If anyone knows what the oil pressure sender value is on the 4jh2 engine please post a reply.