Mechanical Gauges to LS1 fittings

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jacobdavis1979

G-Body Guru
Feb 18, 2011
700
14
18
Hey guys whats up i was hoping someone could help me. Ive googled this already and didn't really find anything. I already had this crappy set of iEquus water temp and oil pressure gauges in my car all mechanical from back when i had the 350 in it. So i have no included adapters or anything to work with. I was hoping someone could tell me the fittings or at least the threads of the fittings so i could adapt these gauges to the 5.3 which i know has metric threads.

I think the temp gauge is 12mm in the block and 1/8 NPT for the line to the gauge.

And on the oil pressure i think the back of the block is 16mm but i have no fitting at all on the oil pressure line i guess my truck took it so i don't know the NPT on it either. Or does a 16mm oil pressure fitting exist?

Can you guys help me as im just guessing on the fitting sizes??
 

truracer20

Master Mechanic
Feb 16, 2014
492
31
28
western PA

jacobdavis1979

G-Body Guru
Feb 18, 2011
700
14
18
Cool looks like im better a guessing threads than i thought. Im gonna try that.
And since im carbed i dont need a coolant temp sensor for the ecm so ive got a perfect place for the gauge probe to go. Just need an adapter for it
 
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