5M tacho with 1UZ motor ???

**Wildsupra** · 13-09-2006, 06:24 PM

Finished puitting my second 1UZ into my MS123 crown.

it originally had a 5M in it.

Tacho is out (obviously going from a six to an eight)

I've been told the 1UZ runs the same as a four cylinder, not going to go into detail, but basically i need to turn a 4 pulse signal into a six pulse so my tacho reads correctly.

Any easy way of doing this without spending too much $$$

Before any1 suggests the trimpot on the gauge, there isnt one, unlike many other toyota tacho's this one does not have one.

Matty

**wilbo666** · 13-09-2006, 06:37 PM

Have a look at putting a RA40 tacho bit into the dash...

I know some poeple have replaced RA40 tacho bits with MX62 cressida when doing 1G conversions...

Cheers
Wilbo

**bansheebuzz** · 13-09-2006, 07:57 PM

take it to an instrument repairer, he will be able to calibrate it to suit. And yes you will require it to operate as a 4 cyl tacho on a 1uz

**sideshow** · 13-09-2006, 09:09 PM

u can take it to guy in marayong and he will calibrate it for 150 to 200 bucks

or i can sell u a digital adjuster box all set up for 1uz 4cly to 6cly for 220 this is gst inclusive

**CrUZida** · 14-09-2006, 09:26 AM

Random that it doesn't have a trimpot, my MX73 is the same age and it has one.

Any 'instrument' place will be able to mod and test it for you.
Shouldn't cost too much.

I know of a place in Balcatta that does it, but thats probably too far for you.

**Wildsupra** · 14-09-2006, 05:59 PM

cheers guys, sideshow, yeah i dont think i'l take it there, bit far for me to drive

Its gotta be simple as, cant take much to turn a 4 pulse signal into a 6 pulse. Peewee can you tell me exactly which wire the trimpot intercepts? i could possible add my own?? although maybe not cos i need toboost the signal pulse not slow it.

Hmmm

gotta be a cheap easy way without pulling my dash out again.

Matty

**gianttomato** · 14-09-2006, 06:00 PM

Originally Posted by Wildsupra

Finished puitting my second 1UZ into my MS123 crown.
Matty

Pics. Another UZ powered Crown is good.

**Wildsupra** · 14-09-2006, 06:18 PM

Check it out dude.

http://www.toymods.net/forums/showth...595#post233595

**sideshow** · 15-09-2006, 10:32 AM

you might need to boost the signal too cause i had to in my hilux tacho
then adjust the signal

**jonra23** · 16-09-2006, 11:46 AM

If you combine the spark pulses from both coil together will give an 8 cylinder output and then add trimpot to tacho to adjust down to give correct reading on a 6 cylnder tacho would work.

Both covered in Hens thread here.
http://www.toymods.net/forums/showth...ighlight=tacho

regards
jon