Converting Oil Temp gauge to Oil Pressure Gauge? |
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Converting Oil Temp gauge to Oil Pressure Gauge? |
9144me2enjoy |
Aug 5 2018, 08:34 PM
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#1
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Member Group: Members Posts: 310 Joined: 19-June 18 From: Oregon Member No.: 22,240 Region Association: Pacific Northwest |
1973 Porsche 914 2.0L. I’m removing my Oil Temp Gauge and installing a Oil Pressure Gauge. I installed a 100 psi VDO Oil Pressure Gauge. Do to the size of the new Sender Unit that fits a 100 psi VDO Gauge you cannot just insert it in the same location in the Taco Plate! I was able to drill a 7/16 hole in the same plate and install the new sender unit. I left the original sender unit where it was at and just removed the plug and placed it on the new 100 psi Oil Pressure Sending Unit. On the other end I just plugged the original harness back in the same 3 prong plug in on the back off the new VDO Oil pressure gauge. Sending unit wire to G and the + to fuse box etc. No reading on gauge! What’s wrong. The new sending unit is extended about 1/2” inside. Any suggestions. Thanks
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falcor75 |
Aug 6 2018, 01:08 AM
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#2
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Senior Member Group: Members Posts: 1,579 Joined: 22-November 12 From: Sweden Member No.: 15,176 Region Association: Scandinavia |
I had a piece like this machined to elevate my pressure sender from the stock idiot light location. The sender has two outputs, one for the gauge and one for the idiot light. Mounted it looks like this. |
Dave_Darling |
Aug 6 2018, 12:19 PM
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#3
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
I had a piece like this machined to elevate my pressure sender from the stock idiot light location. The sender has two outputs, one for the gauge and one for the idiot light. Not a good idea. Now you have the weight of the sender and extension pipe all working on the little pipe threads in the case. The pipe acts as a lever arm, even though a short one, and the vibration can eventually damage the threads or the hole in the case. The flexible hose is a better idea, though you do have to make sure to ground the outside of the sender. --DD |
bdstone914 |
Aug 6 2018, 05:53 PM
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#4
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bdstone914 Group: Members Posts: 4,522 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
I had a piece like this machined to elevate my pressure sender from the stock idiot light location. The sender has two outputs, one for the gauge and one for the idiot light. Not a good idea. Now you have the weight of the sender and extension pipe all working on the little pipe threads in the case. The pipe acts as a lever arm, even though a short one, and the vibration can eventually damage the threads or the hole in the case. The flexible hose is a better idea, though you do have to make sure to ground the outside of the sender. --DD (IMG:style_emoticons/default/agree.gif) That is dangerous. It will break and send a oil spout out of the top possible causing a fie when it hits the exhaust pipes/ Use a rear brake line from a 928 Porsche. 92835508002, $20 at 'Reilly. https://www.oreillyauto.com/shop/b/brake-sy...982/porsche/928 |
ClayPerrine |
Apr 18 2019, 03:51 PM
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#5
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Life's been good to me so far..... Group: Admin Posts: 15,465 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
I Vehemently Disagree.
More than 20 years ago, I had a hose like you describe on Betty's car. It broke and sprayed oil all over the engine compartment. We almost lost the engine due to a loss in oil pressure. I will never put one on an engine I build. EVER. Since then, I have run a T fitting to hook up the oil pressure sender, and the idiot light switch. It is mounted as low as possible, putting the pressure sender on its side, laying on the tin. This fixes the worry about the weight of the switch causing the fitting to crack from vibration. The idiot light switch is screwed n the top. In over 20 years and over 300K, I have never had one break. And Porsche used an extension on the 964 motor for the oil pressure sender/switch. Just because everyone does it that way, doesn't mean it is the right way to do it. I had a piece like this machined to elevate my pressure sender from the stock idiot light location. The sender has two outputs, one for the gauge and one for the idiot light. Not a good idea. Now you have the weight of the sender and extension pipe all working on the little pipe threads in the case. The pipe acts as a lever arm, even though a short one, and the vibration can eventually damage the threads or the hole in the case. The flexible hose is a better idea, though you do have to make sure to ground the outside of the sender. --DD (IMG:style_emoticons/default/agree.gif) That is dangerous. It will break and send a oil spout out of the top possible causing a fie when it hits the exhaust pipes/ Use a rear brake line from a 928 Porsche. 92835508002, $20 at 'Reilly. https://www.oreillyauto.com/shop/b/brake-sy...982/porsche/928 |
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