Hi, I'm gonna be installing my autometer gauges but I need to know what the thread pitch is on this sensor? (The one that the pencil is touching). Is this the stock temp sensor? I'm assuming this would be the best place to mount the sensor for the autometer gauge right?

I need to know so that I can order the proper adaptor. The autometer gauge uses a 1/8 npt.

thanks

 

No, that isn't the stock temp gauge sensor.
The stocker is located by the oil pressure sending unit- both of which are below the oil filter pedestal on the driver's side of the engine.

Interesting radiator set up.

 

That doesn't look like an FC engine bay...


-Ted

 

Nope, it's in my first gen.



Your right, now that I think of it, I have the stock water temp hooked up where your talking about. I wonder what that sensor I pointed to is for. Maybe it's to run an electric fan or something? I was told that this jspec motor was from a Cosmo. I know, it's not the 13bre that most are familiar with when reffering to the cosmo but there was an earlier cosmo before that model that had this style of 13bt.

There are a few abnormalities on the motor that are not consistent with a motor from an rx7.

Anyways, I'm sure that thread pitch would probably be the same as that sensor right next to it but I am trying to avoid pulling the senser and getting the thread pitch measured before ordering it.

The radiator is a griffen that was modified to bolt into the first gen.
Don't mind the coolant bottle! ......lol It was a temporary fix.




Here's a couple of more recent pics. It's still a work in progress but hopefully it will make it to sevenstock this year.

 

You'll find these thread pitches listed in the Archives. Also, there are several topics linked in the FAQ which cover temperature gauge installation and where to put the sender.

 

Thanks Aaron!

 

I haven't been able to locate the thread pitches yet in the archives but if it's a m16, I think one of these would work.






http://www.egauges.com/vdo_acce.asp?...apter_Bushings

http://www.egauges.com/vdo_agrp.asp?...pters_Bushings



http://www.autometer.com/cat_accesso...st.aspx?pid=11


Here's another option but don't really want to put it in the heater hose:





http://www.egauges.com/vdo_acce.asp?...ptors&Manf=All

 

Strange, I cannot find it in the archives.

But it's certainly in one of the sensor threads.

I'm fairly sure it's M14, but the easiest way to check is to remove the sensor and measure.

Don't put the sensor in any of the heater pipes.

 

Don't use an adapter, it'll move the sensor out of the flow and reduce its accuracy and will create a lag time between a change and it seeing that change. At worst it'll make the sensor useless. Just drill and tap the water pump housing for a 1/8" NPT sensor, it's not hard.

 

whats wrong with the stock location? put your after market one there, and your stock sensor in your thermostat housing in the acc fan location

 

I'm not awareof any sender that'll fit the stock location meaning you need an adapter and that'll be bad for the reasons previously stated.

 

I do believe that trying to use an adapter in the stock location (rear iron) would keep the sensor from getting flow because you would be going from like 1/8 bspt to 1/8 npt and there wouldn't be much room for the coolant to surround the sensor (if the sensor would even fit in the adapter).




I would think using an adapter like the brass ones shown above would be fine in the water pump housing since it is very similar to the ones supplied with the gauge by autometer. My housing is already tapped for that extra sensor (I guess for an electric fan of some sort) so I would only need the adapter. Since the stock sensor in the housing now is soo big, If I used an adapter at that location, the coolant should still be able to surround the autometer temp sender and I should get accurate temps right?

 

Single wire? Series five? See the COOLING section of the series five manual, page E-14. Aux fan water thermo switch......probably. Pitch? Thread gauge.

 

A 1/8 NPT sensor will thread into the stock sensor location (1/8 BSPT?) just fine...no adaptor needed.
I just did that earlier this week.

 

The thread profiles of the 1/8" NPT and BSP are DIFFERENT. You're messing up one of the threads and this is not a good way to do it. Sure it "works" but it's not the right way to do it. There are some adapters that allow full penetration (sort of like a sleeve), I've got some that came with a VDO sender, but you need a fair bit bigger hole for that to work.

 

The hole where the stock thermo fan sensor was is quite a bit bigger than the 1/8 npt. That's why I'm thinking that the coolant will still surround the temp sending unit. I'll just have to take it out and measure it, then I will probably try the above adapter. I'll let everyone know how it goes.