coolant temp gauge sensor install, what size thread is stock sender?

[float_6969]

why tap a new hole when there is an existing one that is not in use?

id also rather not tap a hole on a nonflat surface and risk it not sealing... its part of the intake manifold, not really easily replaceable

Because the time and effort required to make the existing hole work is outweighed by the ease of drilling a new hole.

The sealing is done at the threads, not at the manifold surface.

for about $25 you can pick up a radiator hose adapter that you just slip inbetween sections of the radiator hose that you can plug in the sending unit into.. its alot easier and you dont risk ruining whatever you tap into..

The problem with this method is that you don't have any reading of what the motor's temperature is until the thermostat opens. If you live someplace that gets cold like in Kansas my thermostat never opens unless I get on the highway for about 5-10 min. If I'm in town running the heater, it never gets hot enough to open it.

[The_Chosen_One]

not to mention the farther away the sensor is from the head the less acurate the reading is. The difference can be up to 5-10*F

[missionsix43]

Because the time and effort required to make the existing hole work is outweighed by the ease of drilling a new hole.

That isnt really true, the only reason it took so long is because the adapters were on backorder, they cost $9 each. Keep in mind, if someone doesnt have a 1/8 npt tap, drill bit, and tap handle, it would cost well over $9 for those.

Personally id rather use the stock port which is no longer being used then tap a whole new hole into the intake manifold.

[missionsix43]

Yea if you can open the hole for me that would be perfect, I have 2 1 for coolant and 1 for Oil temp.

Where are you going to be placing the oil temp one?

I know that the stock oil pressure sensor port is 1/8 bspt, not sure if there are any other ports on the block that are open unless you were planning to put the sensor into the oil drain plug.

[The_Chosen_One]

on the oil drain as its intended purpose, our Oil drain plug is the same size 12Mx1.25

[missionsix43]

on the oil drain as its intended purpose, our Oil drain plug is the same size 12Mx1.25

well email me if you would like it done, i will actually need a measurement of the sender (what you need it to clear) because i didnt write it down...

"kylekochan" at "gmail.com"

[mikesim]

sorry to bring up an old thread, but i've been searching for awhile now, and i'd like to sleep sometime soon.

1: I ordered the coolant temp sensor in the crossover parts section, Coolant temp sensor 25080-89903, but that is for the gauge. it even says on the box from nissan.

2: there's no part # listed for the ECU temp sensor. in the picture above, it's the one with the yellow harness on it, right? i need that sensor!

any help would be appreciated.

[nismoplsr]

I was in the middle of writing a long reply when firefox froze on me...

Someone should take the autometer sensor and put it in some water then heat the water, measure the resistance of it at different temperatures. Then compare it to the FSM.

I know instead of dealing with this problem when i needed to put in a GM sensor for the Haltech the resistances were not exactly the same throughout the temp range but were very very close at operating temperatures. So i am just running the Nissan sensor instead.

My guess the Autometer sensor also reads very similar resistances. Just do a quick experiment and find out.