Monday, December 8, 2025

Holley Sniper Stealth EFI - Part 4 (Temperature Sending Unit)

The Sniper kit came with a coolant temperature sending unit (232R14A).  Unfortunately, I have only one temperature port in my Edelbrock RPM Air Gap intake and it is being used by my current temperature sender that operates my AutoMeter temp gauge (ATM-3531).  My AutoMeter sending unit (#2258) reads 1123 ohms at 100 degrees and 65 ohms at 250 degrees.  Despite all my research, it seems you must use both sending units.

Using both sending units will certainly clutter the under hood appearance. I would need to either find a new thermostat neck or something that goes into the heater output.  For now, I decided to just use the Sniper sending unit and watch my temp on the Sniper display.  However, at some point, I'm going to want both of them working again.

With that decision made, I drained out a good amount of coolant, removed the AutoMeter sending unit, installed the Sniper sending unit, and then put the coolant back in.  Afterwards, I replaced a little black plug in one of the intake runners as it was leaking.  I had a new plug in my spare parts and used Permatex 85420 which is fuel resistant sealant.  I then swapped out the carb studs for a shorter set since I'm not using the old carb spacer.  Lastly, I took the Trans-Adapt (TRD-2178) air cleaner stud I purchased and but about 1/2" off before installing it with a locking nut.  



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