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Old 07-15-2012, 11:12 AM
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Default gauge question revisted

My car has stewart warner stage III gauges in it. My oil temp gauge gives false reading even when its cold.

I bought a set of digital gauges for the car. I mocked up another wiring harness and have both sets of gauges working.

Here is the rub the new oil temp gauge does the same thing. I'm wondering if it is a ground problem. And or I have a small collar that the sending unit is screwed into, And its screwed into the block. I wonder if the collar is causing a lack of ground. SO the ohm reading is wrong . Or is that the motor is not grounded properly to the frame.

Anyways it's driving me crazy................. if you have any ideas
I would happy to hear them.
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Old 07-15-2012, 01:49 PM
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Could be, since the sending unit is new. The block.. well, actually the transaxle.. should have a braided strap going from the bottom bolt on the driver's side to the frame somewhere. It varies from car to car, but it may not be a bad idea to run an independent ground from the battery back to one of the engine mounting studs. That way both the engine and transaxle are grounded. Those braided straps are known to go away after a number of years and hardly anyone bothers to replace them - which leads to all kinds of weird electrical stuff going on!
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Old 07-15-2012, 02:01 PM
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This reminds me of my Bradley GT2. I had a similar problem with it. It turned out there were two different oil pressure sending units. The one I had was the wrong kind. The local V-dub mechanic looked at the engine for about ten seconds, went back into the shop, and came back out with the correct one. It worked like a champ after that.
I don't know if this would be the same issue or not. But I thought I might mention it.
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Old 07-15-2012, 04:45 PM
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Oops... read that as you bought a new sending unit instead of new gauges with senders. Yaughn is correct - there are at least three different senders for the SW gauges, and the chances of the one you have being the correct one for the new digital gauges are pretty slim. Why didn't you purchase the matching senders for those?
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Old 07-15-2012, 09:36 PM
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Quote:
Originally Posted by letterman7 View Post
Oops... read that as you bought a new sending unit instead of new gauges with senders. Yaughn is correct - there are at least three different senders for the SW gauges, and the chances of the one you have being the correct one for the new digital gauges are pretty slim. Why didn't you purchase the matching senders for those?
If I was not clear I bought a new set of led gauges with a new sender. the old sw gauge and sender had the exact same issue

The reason I'm using the old sw III gauges is they are too small and hard to read. also trying to modernize
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Old 07-15-2012, 09:44 PM
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Ah, ok, you didn't say you had bought new senders, just new gauges. Yes, definitely check your grounds, even the one(s) at the instrument panel. Try the trick with a new ground wire to the engine/trans bolts and see what happens.
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