1Jz& 7m tacho comparison for 1jz swap

[Martin P]

Found this info and have reposted it for anyone how may need it

Differences between the 1JZ-GTE tachometer and the 7M-GTE one. Other than the difference in redline, most people till now have surmised the tachs are functionally identical. It appears though that the 1J tach is slightly different in other ways.


7m-GTE tacho(7m-Ge very similar)

http://img.photobucket.com/albums/v665/martin32/7mtach.jpg



1JZ Tacho

http://img.photobucket.com/albums/v665/martin32/1jtach.jpg


both very similar, Except the 1jz has a extra PCB for the low oil light.

BUT this is the circuit board for all tacho's with a break down of the components under it

http://img.photobucket.com/albums/v665/martin32/tachbits.jpg

7m-Ge 7M-GTE 1JZ-GTE


R1 62k 100k 130k
R2 12k 12k 12k
R3 510 510 560
R4 30k 15k 15k
R5 55K 55k 55k
R6 15k 15k 15k
R7 560 560 560
R8 33k 39k 39k
R9 47 47 47
C1 ??? 0.1+35f 0.1+35f
C2 ??? 472 50K NCC 472 50K NCC
C3 47uF 10V 47uF 10V 47uF 10V
C4 ??? 33uF 25V 33uF 25V
IC1 ??? Toshiba 8806K T2685A Toshiba 9214K T2685A

So to get your 7m tacho working correctly with a 1jz swap you need to swap R1 to at same value as the 1jz set up.


This guy compiled the info

by Steve Brecht 2003

[mark3]

And just to add to Martins informative post the only difference between 7MGE and GTE tacho's is 3 different valued resistors to those in the 7MGTE unit, they can be changed to allow 7MGE tacho's to work in a 7MGTE

[Martin P]

And just to add to Martins informative post the only difference between 7MGE and GTE tacho's is 3 different valued resistors to those in the 7MGTE unit, they can be changed to allow 7MGE tacho's to work in a 7MGTE

Yep as stated is the chart at the bottom. MMM thats the chart that has gone stupid LOL

[Martin P]

Fixed now. LOL