see below for info on gtr101 / 104 sensors

This listing will allow an "engine-side of thermostat" temperature gauge with a 1/8npt sensor to be put in early cars that do not have a thread in the head/block for a sensor.  For example an 948 or 803 A-series in sprite, morris minor, Austin A30, mini etc. 

Top-hose-insert ones do not allow for a seized thermostat... they will not read the high temperature if a thermostat seizes. This one will.

It is a sandwich extension for a standard thermostat housing.  The thermostat goes at the top inside the lip. Then all take-offs are BELOW the thermostat, indicating engine temperature. In the event the thermostat seizes, you will have a sensor that tells you. It has two take-offs, a half-inch hose you can simply block...or use for something else...  and  a 1/8" npt thread cut in. It is called SANDWICH-1/8npt. NOTE 1/8npt is a TAPER thread of 27tpi.  The thread is designed and cut to TAPER AND STOP. You have a "conical" cut in here.  Do not over-tighten. Clean, use thread seal. Expect about 5 turns max. 3 min, 7 error. Remember you are screwing brass into aluminium and behave accordingly. Taper threads are DIFFERENT utterly to the "similar looking" parallel threads. The nature of the sealing is DIFFERENT.

I also use my other emergency-light kit that goes in the top hose measuring temp of water as it travels into the radiator. Nothing wrong with more!!

The rubber block is included... or I can not-send it and remove $15 from the price. 

Two gaskets in cork are included.

The thermostat is not included, as you have one, and I dunno what temp you're using.

The temp-gauge** is not included and is just to show you the sensor etc...  

Note I also have these with no thread cut in (SANDWICH-NO THREAD)... if you wish to put in something else like 1/8 BSPP or BSPT etc.

DISCUSSION ON THE GIANT-THREAD GTR101 (and GTR104) SENSOR IN MGB AND MINI. These ones cannot be DIRECTLY screwed into the housing using the method here. The reasons are many. First, the gtr101/4 uses 5/8UNF-18 parallel thread, a fat thread. Calculations show only 4 threads will be in the wall. Parallel threads only have the thread sealant to hold and seal it (unless they also have a pressure olive surface, but in this case it doesn't to the housing, nor an o-ring). 4 threads in aluminium at 5/8" is  dodgy.  In any case, the sensor is at least 5/8" from the ends of the thread to the end of the sensor... or a penatration into the chamber of at least 5/8" or 16mm.  There is only 12mm ABSOLUTE MAX till the sensor hits the thermo spring (9mm is safe). So it cannot work. 

I have done a single unit using an INDIRECT method. A brass fitting of 5/8UNF-18 is cut, installed and sealed permanently in the housing. THEN, the fat sensor screws into THAT.  Being a parallel thread, it must seal in the threads, or a mating surface, or an o-ring. In this case it has 45degree (approx) brass to brass mating surface inside my indirect male/female, that the sensor is tightened against. You MUST use brass-spanner-sensor to brass-spanner-coupling counter-direction-tightening to tighten... NEVER use just one spanner on brass sensor only  as all the opposite force is applied to the adhesion... bad idea. You can see these at the same titles... but a P as the first character, not a T

Note I also have Cooper ones that have 8mm thread cut in (SANDWICH-COOPER).... This is completely useless for any after market gauge. Noone uses 8mm. Only for use with the original 8mm application. 

Note 1/8npt is a taper thread of 27tpi. Beware BSPT 28tpi which also has valleys and angles cut "wrongly". The thread is designed and cut to taper and stop. Do not over-tighten. Clean, use thread seal. Expect about 5 turns max. 3 min, 7 error. Remember you are screwing brass into aluminium and behave accordingly. 

** Electrical temp gauges can be about 45 to 50 bux like this one. Nearly all of them are 1/8npt sensor thread.  Get electric sensor-feed... I don't suggest you buy a capillary type. I just show you here so you can see the sensor and the gauge being used with the sandwich. IT IS NOT INCLUDED... YOU CAN HAVE THIS NEW ONE HERE FOR 50 EXTRA IF YOU WANT.  

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