Testing coolant temperature sender ohms/degrees

[wateka]

In trying to see if my coolant temperature gauge or my coolant temperature sender (or both) were either broken or mismatched by a prior owner, I bought a new temperature sender and tested the resistance at varying temperatures. That table is below. This is sender part # 6658818

° F	° C	Resistance
70°	21	659 Ω
80°	27	539 Ω
100°	38	346 Ω
120°	49	225 Ω
140°	60	151 Ω
160°	71	103 Ω
170°	77	91 Ω
180°	82	78 Ω
185°	85	71 Ω
190°	88	63 Ω
195°	91	57 Ω
198°	92	55 Ω
212°	100	45 Ω

 

[wateka]

Ignore the above table. It was correct for the part I received, but not in spec for the gauge. That's what can happen when I buy parts from Amazon.

I ordered an actual Faria sender (who makes the gauges for Bobcat) and their part number is 90401. It was spot on for ~190°F operating range which is where I expect my Isuzu diesel to spend most of its time.