I purchased an oil pressure gauge with wiring harness and sending unit. I looked in my Bentley Book and it only showed a spot where the oil pressure test gauge would go in front of the oil filter and behind the alternator. I just went out to the car and glanced in that area but only see where the oil light switch wire comes out from the side of the block. Where will I place the sending unit and is there a site that shows a wiring diagram? My car is a
non-turbo B230F engine.

Thanks for looking and any advice.
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'86 sedan with 388,000 miles on the original engine and automatic transmission

Thanks to all.....Guess what I'm doing this weekend?
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'86 sedan with 388,000 miles on the original engine and automatic transmission

1: when you change oil next time, take the oil filter out the way and you can see the old oil pressure send unit. The old one's size is 15/16. make sure you have correct tools.

2: The new pressure should have a adapter and a new washer. The adapter's size is 19mm. Also, do not forget the copper washer!!

3: The new pressure send unit has two terminal, one is called "G" splice to the 5 bar gauge. Another terminal called "KG" spilice to the old dash pressure light(if you still want keep it. )

good luck.

The new sending unit should have 2 connections, one for the new gauge and one for the old idiot light. There is usually an elbow used between the engine and the sending unit.
Dan

Dan,
Go to ebay item #330247078870. What I need to know is, where does the sender thread into?

Thanks, Xraybob.
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'86 sedan with 388,000 miles on the original engine and automatic transmission

Depending on which sending unit you have, you may have to buy an adaptor. The engine block is threaded for a 14mm thread, and most sending units are 1/8 NPT thread diameter and pitch. E-Gauges has these adaptors. They consist of a male 14mm insert and O-ring that threads into the block where the original idiot lamp sender was. Then the sending unit (the new one with 2 connectors) threads into the adaptor. You should not use any teflon tape on these threads, since the unit uses the threaded portion as a ground path. As I said, there will be 2 connectors on the sending unit. Connect the black wire that is already there (the one that was on the old sending unit), and you will need to remove the old connector from the wire and install the appropriate connector to fasten to the new sending unit. Once it is installed, start the engine. If the oil light does not go out, then switch the wire to the other connector. Start the engine again, and the oil light should go out. If it does not, they you probably have the wrong sender. If the light does go out, shut the engine off, and connect the green wire from the gauge to the other connector on the sending unit. If you have the rest of the gauge wired correctly, the gauge should read pressure. Is your gauge a 4 Bar, or a 5 Bar unit? You will need to get the correct sending unit for whichever one you have. If you have a B-230 engine, and a 4 Bar gauge, you will probably peg the gauge on the high side when running the engine. Mine idles cold above 3 bar, and runs about 4.5 Bar on the highway. At Idle hot, the engine reads 2.5 Bar.

Bill
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Those who beat their swords into plowshares will surely plow for those who did not.

Bob
It replaces the cluster/idiot light oil pressure sender. Dan

The idiot light switch is removed and this sender in installed in its place...