dtt900653 Posted May 27, 2006 Share #1 Posted May 27, 2006 does any one have any info about rebuilding early 240z tachs (4 wire). wiring diagrams, comin faliure points, tips, or any thing. i have 2 tachs with 2 different problems and i hope to make one good tach.tach 1: goes to 9000rpm any time the key is ontach 2: nothing happens Link to comment https://www.classiczcars.com/topic/20196-tachometer-rebuild/ Share on other sites More sharing options...
zcarnut Posted May 27, 2006 Share #2 Posted May 27, 2006 I have an early tach schematic I will post after I get it scanned. It’s just a very basic two transistor astable (one-shot) multivibrator circuit that drives the meter coil. The transistors are type 2SB189 (PNP 25V 250mA). Looks like you can still get them: http://www.ceitron.com/semi/ceitoshiba.htmlSteve GolikSmoky Mountain Z Car ClubKnoxville TN1970 240Z1974 260Z1979 810 Hardtop"30 years of Z car ownership" Link to comment https://www.classiczcars.com/topic/20196-tachometer-rebuild/#findComment-168903 Share on other sites More sharing options...
sblake01 Posted May 27, 2006 Share #3 Posted May 27, 2006 Hey Steve, glad to see another fellow 810 coupe owner over here. There aren't many of us. Link to comment https://www.classiczcars.com/topic/20196-tachometer-rebuild/#findComment-168920 Share on other sites More sharing options...
zcarnut Posted May 28, 2006 Share #4 Posted May 28, 2006 Here's the 240Z tach schematic.... Link to comment https://www.classiczcars.com/topic/20196-tachometer-rebuild/#findComment-168996 Share on other sites More sharing options...
dtt900653 Posted May 29, 2006 Author Share #5 Posted May 29, 2006 thanks hopefully now i can fix atleast one of them Link to comment https://www.classiczcars.com/topic/20196-tachometer-rebuild/#findComment-169019 Share on other sites More sharing options...
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