[RicksGTO]

Good post as this is not something you want a false reading on for sure. Lectric Limited has correctly calibrated sending units as well. I have been told by several people about them and have one but the car is not running yet so I can't give feedback on their accuracy first hand yet:
http://www.lectriclimited.com/mainpage.htm

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[317th FMS]

25.00 for lectriclimited sender sounds like a bargain compared to what I paid. Wonder how many radiators and water pumps were replaced because of this sender problem.

[CaptCrunch]

THANKS!.........good to know..........

[giles]

I ran into this issue as well. High gauge indicated temp shortly after a fresh rebuild, recore rad, etc. Checked it with an infrared temp reader - 195F! right where it should be. Borrow or buy an infrared temperature checker before you start replacing alot of expensive stuff. Point it right at the thermostat housing to check the real temperature.

[70RAlll]

I had this same problem years ago. Bought one from Electric Limited or H&H..can't recallw ho it was, and it was still wrong.. The difference is "with guage package" cars(TA"s and Formy's) have a different sender. Most repo senders just use the more common dumb light sender which reads wrong. Maybe the repo's are correct now.. But there is no "calibration" with these, they are not adjustable. Either they aremade correctly or not. Look at one, you will see...there is no way to open it up and change things out.. I suggest finding a used one on Ebay or finding a NOS one.. I bought numerous NOS ones for $75 or so.. I think I have 3-4 now, just to make sure I will never go through that again.. Maybe the repo's have changed the resistence, but yea ago they had it wrong.. Just my opinion and experience..Not trying to bash one company over another..

[njsteve]

Anyone know the correct part number for the original sender?

[njsteve]

Well, I bought one of the $25 Lectric Limited senders, installed it in the cyl head in the factory spot and it reads 25 degrees higher than the radiator water temperature measured with an accurate thermometer dipped into the coolant.

So much for the accurately calibrated reproductions.

On another site one of the guys opined that that the cylinder head mounted temp sensor will give a higher temp reading than the block location. This may be true, but that doesn't explain the accuracy of the original factory senders. Were they undercalibrated to compensate for higher cyl head temps?

[Norwood]

Originally Posted by njsteve

Anyone know the correct part number for the original sender?

Best I can figure group 1.150 pn 6490384