oil temp combo gauge bench testing, what am I doing wrong (question answered) next: calibrate the gauge |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
oil temp combo gauge bench testing, what am I doing wrong (question answered) next: calibrate the gauge |
malcolm2 |
Oct 14 2014, 09:00 PM
Post
#1
|
Advanced Member Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
I have had this gauge for a while. I also found the complete taco plate, sender etc... to set it up. I decided to test it. I tested the sender a while back in hot water and remember getting various readings as the temp increased.
I pulled out my 12v powered drill battery, put 12v + on the + terminal of the gauge and the - on the - of the gauge. ( you can't see the - wire in the picture, but it is there) The gauge moved to where it is in the picture without the sender even being connected. It did not move once the sender was connected. Inside the temp gauge are the following #s. Far left 30, at the start of the red line 156.7 and the end of the red line 170 *C The top of the paper is what is stamped on each face of the hex and the gauge part # has been edited to what you see in the picture. 1. why is the gauge moving at room temp with or with out the sender? 2. do I have this thing hooked up right? any alternate testing suggestions? 3. do I have a matched sender & gauge? |
timothy_nd28 |
Oct 15 2014, 11:37 AM
Post
#2
|
Advanced Member Group: Members Posts: 2,299 Joined: 25-September 07 From: IN Member No.: 8,154 Region Association: Upper MidWest |
For this gauge to act correctly, all wires need to be connected. The actual gauge part has a spring return with two sets of windings that are 90 degrees apart from one another. If the G terminal is not connected, the gauge will float because part of the windings are not biased properly. I didn't see anything out of the ordinary from your initial post, as the gauge behaved as it should with a missing G signal.
I recently integrated a temp gauge in a standard combo gauge for Rnellums, and even with the newer style gauge motors, it did the exact same thing,,because the G wire was floating. I don't think you have anything to worry about. Bruce is correct when he explained how to bench test the gauge. By applying ground to the G terminal, the needle will deflect fully. It's a quick and easy test. If you were to tie the sensor case to the gauge ground, then tie the sensors' isolated terminal to the G terminal, then finally tie power to the gauges + and - terminals, you should see everything work as it should. Then obtain a pot of deionized water, and dip your sender inside this pot while the water is boiling. It's a bunch of mickey mousing around, but a good way to see if your gauge is calibrated and trustworthy. My wife gave me a crazy look, when I had my hands full of jumper wires attached to a car battery while on top of the kitchen stove. (IMG:style_emoticons/default/blink.gif) I told her that I was making a prototype cold fusion reactor! |
Lo-Fi Version | Time is now: 18th May 2024 - 04:24 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |