DRCOFFEE

I am installing a transmission temp gauge in my rig to the left of the steering wheel in the dead switch area. So I bought and installed a Glowshift gauge and I really do like it but it has a magnefied lense which makes it hard to read where I have it installed. So I bought a new Autometer gauge 2640 to replace it.


Now both gauges come with a sender and I searched across the web for a Ohm map to compare the two senders. Why change out the glowshift sender if its compatible with autometer gauges? Well it looks like it a direct replacement. The reason for this thread is to let you know the glowshift sender is a 2 wire sender which will make grounding it a little easier and a cleaner install.

Here are the Resistance (Ohm) maps for each brand.


Here's what I found when I emailed Glowshift's tech dept.:
Glowshift
Ohms.....Degrees F*
925.........104*
438.........140*
224.........176*
120.........224*
68...........248*
41...........284*



Autometer
Auto Meter 2258/2259 Thermistor Specifications
Temperature = Ohms:
100°F = 1123Ω ±102Ω (Enter 999 - above this, ECU defaults to 'Ohms x 10'.)
120°F = 708Ω ±59Ω
140°F = 460Ω ±35Ω
150°F = 374Ω ±27Ω
170°F = 253Ω ±17Ω
190°F = 175Ω ±10Ω
200°F = 149Ω ±8Ω (I mathematically averaged this in, for 16 data points.)
210°F = 123Ω ±7Ω
212°F = 119Ω ±6Ω
220°F = 105Ω ±5Ω
230°F = 89Ω ±5Ω
250°F = 65Ω ±4Ω
280°F = 42Ω ±3Ω
300°F = 32Ω ±2Ω
320°F = 25Ω ±2Ω
340°F = 20Ω ±1Ω



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And just in case you may be curious about the other Autometer sender:

Auto Meter 2252 (Delphi 12160855) Thermistor Specifications
Metri-Pack mating connector ~ 12047662 & TPA lock ~ 12047664
Metri-Pack terminals ~ 12047767 .039"-.031" & 12064971 .020"-.014"
Temperature = Ohms:
-40°F = 402392Ω ±1.8°C
-31°F = 288981Ω ±1.8°C
-22°F = 209817Ω ±1.8°C
-13°F = 153922Ω ±1.8°C
-4°F = 114026Ω ±1.8°C
5°F = 85256Ω ±1.8°C
14°F = 64306Ω ±1.8°C
23°F = 48910Ω ±1.7°C
32°F = 37499Ω ±1.7°C
41°F = 28977Ω ±1.7°C
50°F = 22572Ω ±1.7°C
59°F = 17717Ω ±1.7°C
68°F = 14007Ω ±1.7°C
77°F = 11150Ω ±1.7°C
86°F = 8935Ω ±1.6°C
95°F = 7204Ω ±1.6°C
104°F = 5844Ω ±1.6°C
113°F = 4768Ω ±1.6°C
122°F = 3911Ω ±1.6°C
131°F = 3226Ω ±1.5°C
140°F = 2676Ω ±1.5°C
149°F = 2232Ω ±1.5°C
158°F = 1870Ω ±1.5°C
167°F = 1574Ω ±1.4°C
176°F = 1331Ω ±1.4°C
185°F = 1131Ω ±1.4°C
194°F = 964.7Ω ±1.3°C
203°F = 826.2Ω ±1.3°C
212°F = 710.2Ω ±1.3°C
221°F = 612.9Ω ±1.2°C
230°F = 530.9Ω ±1.2°C
239°F = 461.5Ω ±1.2°C
248°F = 402.6Ω ±1.1°C
257°F = 352.3Ω ±1.1°C
266°F = 309.3Ω ±1.1°C
275°F = 272.4Ω ±1.1°C
284°F = 240.6Ω ±1.1°C
293°F = 213.2Ω ±1.1°C
302°F = 189.3Ω ±1.1°C




Update: I swapped out the glowshift with a Autometer gauge after verifying the gauges were reading the same temp once I brought it up to operating temperature.

Just an aside. I was able to scrounge a nice 2 wire weather pack electrical connector off of a Volkswagon in a junk yard to replace the bullet connectors in the picture above. I paid $2 for 3 of them. This make maintenance in the future much easier.

Texas_Ace

I would get a pillar pod for the gauges personally, a lot cleaner and can be undone later if you decide you want to change things up. Also allows you to install a few gauges in direct line of sight.

Far as the sender, up to you, you can most likely use either sender but the readings may be screwed slightly.