Temperature Gauge Sending Unit
Thread Starter
Instructor
Joined: Nov 2002
Posts: 105
Likes: 7
From: Nicholasville KY
Temperature Gauge Sending Unit
I have a 69 350 and initially the temp gauge was maybe 120 fully hot. I grounded the gauge wire and it swung way past 250 almost pointing down. When I left it open (off the unit) it went under 100. A shop replaced the sending unit and said a "sender for a fan" had been installed. Now the gauge shows 230 to almost 250. Can this be corrected with a resistor? Or what would be the correct sender and source? Thanks for any help!
Last edited by RED-C5; Aug 21, 2022 at 09:27 PM. Reason: Spelling error
Melting Slicks
Joined: Dec 2009
Posts: 3,225
Likes: 654
From: Thunder Bay
I have a 69 350 and initially the temp gauge was maybe 120 fully hot. I grounded the gauge wire and it swung way past 250 almost pointing down. When I left it open (off the unit) it went under 100. A shop replaced the sending unit and said a "sender for a fan" had been installed. Now the gauge shows 230 to almost 250. Can this be corrected with a resistor? Or what would be the correct sender and source? Thanks for any help!
Melting Slicks
Joined: Dec 2009
Posts: 3,225
Likes: 654
From: Thunder Bay
Rock Auto lists senders from several manufacturers. Should also be available from any of the Corvette Suppliers. Not sure what is up with Willcox. Hopefully they will be back in business soon.
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Melting Slicks
Joined: Dec 2009
Posts: 3,225
Likes: 654
From: Thunder Bay
I can’t really answer that. I got the adjustable resistor kit from Willcox. The instructions were very clear and it worked perfectly, but IIRC the kit replaces the factory resistor so I don’t know if I was increasing or decreasing the resistance from the factory value. Hopefully Willcox will be back on line soon and you can order the kit. I also think you should start with the correct sender.