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Tacho reading 2000rpm too high?


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#1 IMORAL

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Posted 25 August 2016 - 11:50 PM

Im sure its been discussed numerous times but I cant find the answer.

Problem: Lc with 202. Crane cam fireball hi-6 ignition system

Connect the tach output wire to tach. Nothing
Connect a wire from -ve side of coil. Tach reads 2600rpm at idle. Same reading with 3 gtr dashes. Tried a cheapo after market one. Same thing 2600

Tried auto meter one while still on -ve side of coil. Nothing.
Connected it to tach out put. 650 rpm.

I tried 4 different resistors but they made no difference

So my question is how are you guys getting your geniune tacho working when using electronic systems?
TIA

#2 madtoranajzedded

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Posted 26 August 2016 - 03:54 AM

Hi Paul.sorry i cant really help you but
when i got my wiring converted to run gtr
dash Aaron (sparky) asked if i was going to
use electronic dissy ,i said.. yeah later..so
he just mentioned the resistance wire for
points only gives out 8 volts and just
wired in another pink wire for when i go electronic.thinking maybe you will have to
do the same..

Edited by madtoranajzedded, 26 August 2016 - 03:54 AM.


#3 _COSH_

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Posted 26 August 2016 - 07:08 AM

Im sure its been discussed numerous times but I cant find the answer.

Problem: Lc with 202. Crane cam fireball hi-6 ignition system

Connect the tach output wire to tach. Nothing
Connect a wire from -ve side of coil. Tach reads 2600rpm at idle. Same reading with 3 gtr dashes. Tried a cheapo after market one. Same thing 2600

Tried auto meter one while still on -ve side of coil. Nothing.
Connected it to tach out put. 650 rpm.

I tried 4 different resistors but they made no difference

So my question is how are you guys getting your geniune tacho working when using electronic systems?
TIA

You need a Tach Adapter.  Just make sure you pick the correct one for your ignition type: Points or electronic.

 

8910 is for points, 8920 is for electronic. 



#4 IMORAL

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Posted 26 August 2016 - 07:52 AM

Hi Paul.sorry i cant really help you but
when i got my wiring converted to run gtr
dash Aaron (sparky) asked if i was going to
use electronic dissy ,i said.. yeah later..so
he just mentioned the resistance wire for
points only gives out 8 volts and just
wired in another pink wire for when i go electronic.thinking maybe you will have to
do the same..

That will be so you have 12 volts instead of 8 for the unit

You need a Tach Adapter.  Just make sure you pick the correct one for your ignition type: Points or electronic.
 
8910 is for points, 8920 is for electronic.

I will look into it thanks

#5 S pack

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Posted 26 August 2016 - 07:54 AM

Installation Instructions. Maybe someone else can work out how to fix.

https://static.summi...n-6000-6440.pdf



#6 IMORAL

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Posted 26 August 2016 - 11:30 AM

I brought a MSD tach adapter today so when it arrives next week I will see if it fixes it

#7 LJ RB30

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Posted 26 August 2016 - 12:43 PM

Yep I used the msd tach adaptor on my crane hi6 to run the stock gtr tacho.

The msd ones look nicer than the crane ones too!

#8 madtoranajzedded

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Posted 26 August 2016 - 01:48 PM

Oh.ok..so i will have to get an adapter
aswell bud, when i change to ice ignition
or is this just for the fireball hi 6

Edited by madtoranajzedded, 26 August 2016 - 01:50 PM.


#9 LJ RB30

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Posted 26 August 2016 - 04:32 PM

I have no experience with ice ignitions but at least they are local to be able to ask them if you have issues.

MSD's & Cranes only really need them with certain types of tacho's ie old Holdens!

Edited by LJ RB30, 26 August 2016 - 04:35 PM.


#10 jd lj

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Posted 26 August 2016 - 06:48 PM

The factory tachometers read a coarse signal but the msd 6-al2 gives off a fine signal. The local instrument repair guy in my area did something to modify my tacho and it now works fine (with no tach adapter). I just took the instrument panel to him and he worked his magic.

#11 IMORAL

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Posted 26 August 2016 - 09:15 PM

Yep I used the msd tach adaptor on my crane hi6 to run the stock gtr tacho.
The msd ones look nicer than the crane ones too!


Bloody beauty. Good to know

#12 IMORAL

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Posted 07 September 2016 - 09:51 PM

FYI
The msd tach adapter has it working like a new one. Happy days :spoton:

#13 LJ RB30

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Posted 07 September 2016 - 10:52 PM

:spoton:






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