[rfmaster]

Originally Posted by misternash2

ok guys coulda, shoulda, woulda. i put a 5.3 in my 85 chevy pickup and i since i did it pretty much in one weekend, i didn't look far enough ahead. what i should have done is drill and tap the right head 3/8 npt to fit the stock sending unit. what i did was drill and tap 1/4 npt thinking that it would be no problem finding a sending unit that was 1/4 npt. of all the gm cars and trucks made, surely they put one in something, right? well, not that i'm aware of. my local parts guy tried to help me, but couldn't. i'm just happy he tried. more than i can say for the "better" parts guys in town. they pretty much blew me off.

so in short, i'm looking for a sender that will communicate properly with the guage set from a 91 suburban that's 1/4 npt.

yes, i know i made a mistake. all the same, i don't want to pull the engine to drill and tap 3/8. (i've got a factory air truck and it's close to the dryer/airbox area) thanks in advance to anyone and everyone who can help.

Take your current temp sending unit and measure its resistance under the following conditions:

0 C - place sensing unit into freezer
22C - room temperature
100C - place it into boiling water.

You may need to rig up jumper wires to make measurements easier. After getting this resistance vs. temp data a curve can be built. 1/4" NPT units are used in newer cars and trucks - by looking up temp curves an equivalent (in terms of the resistance vs. temp) can be sourced.

Alternative solution:
http://www.ls1tech.com/forums/14117849-post31.html


//RF