 2 liter engine swap question. Oil pressure sensor? |
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| roundtwo |
 Jun 23 2026, 04:48 PM
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#1
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Member  Group: Members Posts: 359 Joined: 9-February 20 From: Petaluma, CA Member No.: 23,905 Region Association: Central California 
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Have a 1971 that I purchased a few years back from the original owner. He upgraded it to a 2 L some time back.
Fortunately, I have a 2 L that I bought from a customer at Eason Auto Works who was upgrading to a six in his 914. It had all the documentation from the rebuild and only about 35K on it. Fast-forward to now and I’m transplanting that engine into the 1971. See pictures. Pic 1. Replacement engine with sensor. Pic 2. Original engine with oil pressure Pic 3. Original engine sending unit (?) Original engine in picture number one and number two. Oil pressure sensor next to the distributor. The replacement engine I have only has an engine temperature sensor? in the same spot. Car has a oil pressure gauge Do I need remove the engine tin to swap out the base of the oil pressure fitting? I’m not sure what I’ll find under there. I would like a working gauge, but I’ve read on some of the forums that having an oil pressure sensor leak rapidly can be catastrophic if it fails Appreciate some advice about this. .    |
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| roundtwo |
Jun 23 2026, 04:49 PM
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#2
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Member Group: Members Posts: 359 Joined: 9-February 20 From: Petaluma, CA Member No.: 23,905 Region Association: Central California
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Pic 3
 Engine surgery room  |
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| 930cabman |
Jun 23 2026, 06:42 PM
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#3
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Advanced Member Group: Members Posts: 4,722 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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I simply insert a T fitting on a short hose (as shown), one side to the case, one to the factory idiot light and the other to a copper line into the cockpit for an actual gauge
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| Montreal914 |
Jun 23 2026, 08:58 PM
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#4
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Advanced Member Group: Members Posts: 2,148 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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Your picture #3 shows the oil pressure sender. This model has two connection points, one is for the pressure gauge and the other is for the pressure light if I recall. That being said, I am not sure if the trigger for the pressure light is set at the same pressure as the stock one you show in picture 2.
Important, the ouside shell of the pressure sender (picture 3) needs to be connected to ground. Notice the metal clamp around it, make sure it is fastened to make ground. That's all I have, other will chime in. Good luck! (IMG:style_emoticons/default/smile.gif) |
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| Jack Standz |
Jun 23 2026, 09:51 PM
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#5
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Senior Member Group: Members Posts: 853 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None
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For an oil pressure gauge and an oil pressure light, you need the pressure line (a Porcshe 928 brake line works) shown in pic2 and a double pole sender as shown in pic3. Yes, you need to make sure the sender housing is connected to a good ground.
You can use one of these to install the hose (get a set with the right sizes of sockets): https://www.amazon.com/Orion-Motor-Tech-Inj...C425&sr=8-7 Attached image(s) 
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