Temperature Sender

[njsteve]

OK, just got an original, vintage GM 1513321 temp sender, here is the updated chart:

80 degrees: Wells at 650 ohms, LL at 573 ohms, GM at 549
90 degrees: Wells at 526 ohms, LL at 445 ohms, GM at 524
100 degrees: Wells at 429 ohms, LL at 365 ohms, GM at 409
110 degrees: Wells at 328 ohms, LL at 266 ohms, GM at 365
120 degrees: Wells at 283 ohms, LL at 227 ohms, GM at 323
130 degrees: Wells at 250 ohms, LL at 200 ohms, GM at 272
140 degrees: Wells at 216 ohms, LL at 170 ohms, GM at 227
150 degrees: Wells at 198 ohms, LL at 155 ohms, GM at 195
160 degrees: Wells at 173 ohms, LL at 133 ohms, GM at 175
170 degrees: Wells at 157 ohms, LL at 119 ohms, GM at 157
180 degrees: Wells at 135 ohms, LL at 101 ohms, GM at 140
190 degrees: Wells at 120 ohms, LL at 89 ohms, GM at 125
200 degrees: Wells at 109 ohms, LL at 79 ohms, GM at 109
212 degrees: Wells at 104 ohms, LL at 75 ohms, GM at 102

Looks like the Wells sender is pretty darn close to the original GM sender's specs. I'd say it's a dead-on match given my pot of hot water on the stove, scientific method.

[Jim69Z]

Reviving this thread as my 69 with factory console gauge is reading in hot range... Purchased the wells tu12 and it has a straight pin on the end and is not threaded... Would this be correct for my application ? Thanks for any help

[enio45]

i just did this for my 69Z application, console with gauges and the wells from auto zone is right on the money.....6 bucks as well!

[SS427]

I have at least 15 Wells units in my inventory. Each one is marked with a Sharpie # (1-15) which correlates to a chart I made similar to Steve's after cooking each one on hot plate pot of antifreeze at the time of purchase. No two read alike and almost every car I restore the gauge reads much hotter than the engine actually is using an infra red and thermometer both. Wells has been the closest to OEM more than any other supplier but there is still no consistency or accuracy.

[Jim69Z]

Eddie .. Was the end threaded on the sender as the tu12 from adavance auto was not as it had a straight pin coming out so I ordered another one and it came same way... Going to try again as it keeps going to near h on gauge
Any chance that the resistor on the back of the gauge goes bad?
Thanks

[enio45]

It was threaded - the resistor can be measured for ohms....not sure what the ohm should be, but possible, however, if a resistor goes bad, the resistance usually goes high or completely open....thus a low reading.....

i got mine thru auto zone -

[DW31S]

Has anyone here (that are WAY smarter than me on the electrics and electronics) found a suitable replacement for the sending unit for an electric Sun Temp Gauge? The originals from Sun are nearly impossible to find; there is a fellow on eBay that claim he makes a replacement that works and will have identical readings. I grabbed my ankles and bought two of them because I love the Sun gauges and eventually will have them installed in both cars. As of now, I have NOT tried the "eBay" senders, so I can't speak for their operating in terms of being "correct". I'd really like to hear from anyone with knowledge on the Sun stuff.

[cwc]

Originally Posted by DW31S

Has anyone here (that are WAY smarter than me on the electrics and electronics) found a suitable replacement for the sending unit for an electric Sun Temp Gauge? The originals from Sun are nearly impossible to find; there is a fellow on eBay that claim he makes a replacement that works and will have identical readings. I grabbed my ankles and bought two of them because I love the Sun gauges and eventually will have them installed in both cars. As of now, I have NOT tried the "eBay" senders, so I can't speak for their operating in terms of being "correct". I'd really like to hear from anyone with knowledge on the Sun stuff.

A friend of mine has made me 2 senders for the sun temp gauge,I'm gonna try and get them next week and see how accurate,if they are correct.we can make several more. I am planning on offering to members at a reasonable price

[DW31S]

Wow! That is great news! I hope they work! I have another one that is supposed to be included in a set of gauges that I recently purchased. That one and the gauges are waiting at my local post office for me to pick up. I can visually compare that one to the EBAY units and see if they match. I don't have the needed equipment to check anything else.

[k92]

Mr. Hartman, did you by chance ever live around the Chicago area and own a 1970 Chevelle?