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gaffrig water temp guage like 70 degrees off?

Old 06-15-2007, 11:02 AM
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Default gaffrig water temp guage like 70 degrees off?

i have been chasing this problom for almost a year, and i cant figure it out. the guage will read 220f when the engine is warm, but i have checked the enigne with other gauges and a raytec gun and the motor is between 135f-140f so i know the motor is not overheating. i have replaced the guage, sending unit, the sending wire, cleaned grounds and the guage still reads about 70 degrees higher than the engine really is? anyone have any ideas?
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Old 06-22-2007, 08:31 AM
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anyone have any ideas? this is driving me nuts.
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Old 06-22-2007, 08:44 AM
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are you using any kind of thread sealant on the sending unit? it may be interfering with the grounding of it....
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Old 06-22-2007, 08:49 AM
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yes i do have white permatex on the sending unit. very well could be the problom. i will have to go home to do a little testing tonight. any other posabiltys?
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Old 06-22-2007, 09:15 AM
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Any chance the sending unit and the gauge are not compatable?
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Old 06-22-2007, 09:48 AM
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Originally Posted by BenPerfected
Any chance the sending unit and the gauge are not compatable?
both guage and sender are right from gaffrig
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Old 06-22-2007, 10:06 AM
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the sealant/ bad ground is the answer. that was good thinking wally.
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Old 06-22-2007, 10:21 AM
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take the sender out and extend the signal wire and ground to battery so that you can put it in some heated water of a known temp. If the gauge reads correct then you most likely do have a grounding issue.

On the other hand I have bought a gaffrig oil temp gauge and sender that were not compatible. (read high)
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Old 06-22-2007, 10:24 AM
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Originally Posted by 98itrwhite
yes i do have white permatex on the sending unit. very well could be the problom. i will have to go home to do a little testing tonight. any other posabiltys?
use a multimeter to test for a good ground from the sender body to the block, should be zero resistance. This is a good idea any time you change any sender btw, regardless of what thread sealant you use.
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Old 06-22-2007, 11:44 AM
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Originally Posted by Wobble
take the sender out and extend the signal wire and ground to battery so that you can put it in some heated water of a known temp. If the gauge reads correct then you most likely do have a grounding issue.

On the other hand I have bought a gaffrig oil temp gauge and sender that were not compatible. (read high)
the guage at one time read correctly. then i sent my engine out for a rebuild and dyno tune and ever since i got it back from the engine builder it has read 70degrees hotter than norm.
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