water temp gauge on A

Can you use this temp gauge on the non pressurized cooling system? It sure is cheaper than the other!! ater Temperature Gauge w IH Logo - TEMPERATURE GAUGE WITH 19 inch LEAD & IH Logo. For Tractors equiped with pressure type radiator - SN 115030 & up. FITS MODELS A, H, M, SUPER A, SUPER M (300, 350 UTILITY). Fitting may require the OEM Adapter 51510D which we do not have available. (Part No: 67135D)
 
Pressurized systems allow the coolant temperature to go higher before boiling than non pressurized systems. Therefore the readings will always be on the low side with the color codes for a pressurized system. Since the sensor goes in the lower inlet to the engine block, the correct gauge will read low anyway. There is no advantage to the one you mention, if you want one get the correct one, but unless you have a serious cooling problem it won't help you much. On my Super A, I used a modified upper outlet from a C123 so that it reads the exiting hot water from the block, instead of the cool water at the bottom of the radiator. The ad you quoted says it fits, that doesn't mean it will read correctly, at least according to the cold run hot color codes. Actually, I did the opposite thing, mine reads high, I think because it is for a non-pressurized system, I ordered the wrong one.
 
Ok. Well that makes sense. I was looking at it from a cost perspective. Most likely it would never move if I used the one I mentioned. That also explains the longer lead... 19" vs. 14".
 

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