Exhibit 4.6

FIRST SUPPLEMENTAL INDENTURE

FIRST SUPPLEMENTAL INDENTURE (thisSupplemental
Indenture), dated as of August 10, 2007, among the new guarantors set forth on Schedule I attached hereto, (the New Guarantors), each of which is a subsidiary of Sensata Technologies B.V., a private company
with limited liability incorporated under the laws of the Netherlands (the Company), and The Bank of New York, a New York banking corporation, as trustee under the Indenture referred to below (the Trustee).

W I T N E S S E T H

WHEREAS,
the Company and the existing Guarantors have heretofore executed and delivered to the Trustee an indenture (as amended, supplemented or otherwise modified, the Indenture), dated as of April 27, 2006 providing for the issuance
of 9% Senior Subordinated Notes due 2016 (the Notes);

WHEREAS, Section 4.17 of the Indenture provides that under
certain circumstances the New Guarantors shall execute and deliver to the Trustee a supplemental indenture pursuant to which the New Guarantors shall unconditionally guarantee all of the Companys Obligations under the Notes and the Indenture
on the terms and conditions set forth herein (the Guarantee); and

WHEREAS, pursuant to Section 9.01 of the
Indenture, the Trustee, the Company and the existing Guarantors are authorized to execute and deliver this Supplemental Indenture.

NOW
THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the New Guarantors, the Company and the Trustee mutually covenant and agree for the equal and ratable benefit of
the Holders of the Notes as follows:

1. DEFINED TERMS. Defined terms used herein without definition shall have the meanings assigned to
them in the Indenture.

2. AGREEMENT TO GUARANTEE. The New Guarantors hereby agree, jointly and severally with all existing Guarantors (if
any), to provide an unconditional guarantee on the terms and subject to the conditions set forth in Article 11 of the Indenture and to be bound by all other applicable provisions of the Indenture, including the provisions relating to the
subordination of such guarantee set forth in Article 10, and the Notes and to perform all of the obligations and agreements of a Guarantor under the Indenture.

3. NO RECOURSE AGAINST OTHERS. No past, present or future director, manager, officer, employee, incorporator, stockholder or member of the Company, any parent entity of the Company or any Subsidiary, as such, will
have any liability for any obligations of the Company or the Guarantors under the Notes, the Indenture, the Guarantees or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting a Note
waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes. The waiver may not be effective to waive liabilities under the federal securities laws.



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4. NOTICES. All notices or other communications to the New Guarantors shall be given as provided in
Section 13.02 of the Indenture.

5. RATIFICATION OF INDENTURE; SUPPLEMENTAL INDENTURES PART OF INDENTURE. Except as expressly amended
hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every
Holder of a Note heretofore or hereafter authenticated and delivered shall be bound hereby.

6. GOVERNING LAW. THE INDENTURE, THIS
SUPPLEMENTAL INDENTURE, THE NOTES AND THE NOTE GUARANTEES SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

7. COUNTERPARTS. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

8. EFFECT OF HEADINGS. The section headings herein are for convenience only and shall not affect the construction hereof.

9. TRUSTEE MAKES NO REPRESENTATION. The Trustee makes no representation as to validity or sufficiency of this Supplemental Indenture.



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IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed and
attested, all as of the date first above written.



SENSATA TECHNOLOGIES FINANCE COMPANY, LLCBy:

/s/ Thomas WroeName:

Thomas WroeTitle:

DirectorSENSATA TECHNOLOGIES, INC.By:

/s/ Thomas WroeName:

Thomas WroeTitle:

Chief Executive OfficerSENSATA TECHNOLOGIES HOLDING COMPANY US B.V.By:

/s/ Amaco Management Services B.V.Name:

Amaco Management Services B.V.Title:

Managing DirectorSENSATA TECHNOLOGIES HOLDING COMPANY MÉXICO B.V.By:

/s/ Amaco Management Services B.V.Name:

Amaco Management Services B.V.Title:

Managing DirectorSENSATA TECHNOLOGIES DE MÉXICO, S. DE R.L. DE C.V.By:

/s/ Thomas WroeName:

Thomas WroeTitle:

Director




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SENSATA TECHNOLOGIES SENSORES E CONTROLES DO BRASIL LTDA.By:

/s/ Thomas WroeName:

Thomas WroeTitle:

DirectorSENSATA TECHNOLOGIES JAPAN LIMITEDBy:

/s/ Thomas WroeName:

Thomas WroeTitle:

DirectorSENSATA TECHNOLOGIES (KOREA) LIMITEDBy:

/s/ Thomas WroeName:

Thomas WroeTitle:

DirectorSENSATA TECHNOLOGIES HOLDING (KOREA) LIMITEDBy:

/s/ Thomas WroeName:

Thomas WroeTitle:

DirectorSENSATA TECHNOLOGIES MALAYSIA SDN. BHD.By:

/s/ Thomas WroeName:

Thomas WroeTitle:

DirectorSENSATA TECHNOLOGIES B.V.By:

/s/ Amaco Management Services B.V.Name:

Amaco Management Services B.V.Title:

Managing Director




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THE BANK OF NEW YORKas TrusteeBy:

/s/ Isaura TolentinoName:

Isaura TolentinoTitle:

Assistant Vice President




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Schedule I New Guarantors



|                                                          |  |                  
|--------------------------------------------------------- |  | -----------------
|Guarantor                                                 |  | Jurisdiction     
|Sensata Technologies Finance Company, LLC                 |  | (U.S. - Delaware)
|                                                          | 
|Sensata Technologies, Inc.                                |  | (U.S. - Delaware)
|                                                          | 
|Sensata Technologies Holding Company US B.V.              |  | (Netherlands)    
|                                                          | 
|Sensata Technologies Holding Company México B.V.          |  | (Netherlands)    
|                                                          | 
|Sensata Technologies de México, S. de R.L. de C.V.        |  | (Mexico)1        
|                                                          | 
|Sensata Technologies Sensores e Controles do Brasil Ltda. |  | (Brazil)         
|                                                          | 
|Sensata Technologies Japan Limited                        |  | (Japan)          
|                                                          | 
|Sensata Technologies (Korea) Limited                      |  | (Korea)          
|                                                          | 
|Sensata Technologies Holdings (Korea) Limited             |  | (Korea)          
|                                                          | 
|Sensata Technologies Malaysia Sdn. Bhd.                   |  | (Malaysia)       



|1 | To become a guarantor under that certain Senior Subordinated Term Loan Agreement dated as of July 27, 2007 (the
Loan Agreement) among the Company, Sensata Technologies Finance Company, LLC, a Delaware limited liability company, the guarantors from time to time party thereto, the lenders from time to time party thereto, Morgan Stanley Senior
Funding, Inc., as administrative agent, Banc of America Bridge LLC, as syndication agent, Goldman Sachs Credit Partner L.P., as documentation agent, and the other parties named therein, within 30 days of the effective date of the Loan Agreement.
|- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------