tachometer (RPM) 6 cylinders to 4 cylinders move

[comanche87-BRD]

Hello

 

I have no tachometer to my Comanchen and would like to postprepare with pleasure one. Now I have asked in Germany already everywhere, however, for 4 cylinders I get nobody. Now I have a tachometer (RPM) of 6 cylinders here and wanted to ask you sometimes whether one cannot alter him thus this with my 4 cylinders engine functions.

 

If somebody can help me please of you

 

Greeting Peter

[mvusse]

As far as I know, some '87 and all '88 and newer ones have an adjustment screw on the back. But you will need a hand held tachometer to calibrate it against.

[JENSSEN]

On the weekend I plugged in a XJ cluster (4.0L) into my 88 (2.5L) and the tach did indeed work but the water temp and oil pressure did not,.. Now I am unsure if they worked before as I had not tested it before in another truck but the tach did work.

 

Hope that helps!

[Geonovast]

The 6 cylinder tach will work, but will read 2/3rds of actual rpm. You'll need to adjust the potentiometer on the back,

[comanche87-BRD]

Thanks for your answer but can you wright me what the right potentiometer on the back is.

 

Have you a picture ?

 

Peter

[vaquaro]

Thanks for your answer but can you wright me what the right potentiometer on the back is.

 

Have you a picture ?

 

Peter

here's a link for you http://widetrackdrive.com/temp/mj/tach-pot.jpg :cheers:

[Eagle]

Thanks for your answer but can you wright me what the right potentiometer on the back is.

 

Have you a picture ?

 

Peter

here's a link for you http://widetrackdrive.com/temp/mj/tach-pot.jpg :cheers:

That's a good photo. The potentiometer is the part labeled "J103C"

[mvusse]

On the weekend I plugged in a XJ cluster (4.0L) into my 88 (2.5L) and the tach did indeed work but the water temp and oil pressure did not,.. Now I am unsure if they worked before as I had not tested it before in another truck but the tach did work.

 

Hope that helps!

 

Did your old gauge cluster have dummy lights, or gauges?

[comanche87-BRD]

Hello Boys

 

my big respect for your quick help many many thanks for it and all best greetings from Old Germany :bowdown: :bowdown: :bowdown:

 

Peter

[JENSSEN]

On the weekend I plugged in a XJ cluster (4.0L) into my 88 (2.5L) and the tach did indeed work but the water temp and oil pressure did not,.. Now I am unsure if they worked before as I had not tested it before in another truck but the tach did work.

 

Hope that helps!

 

Did your old gauge cluster have dummy lights, or gauges?

 

 

Dummy lights ,.. I miss needles moving in front of me

[Geonovast]

On the weekend I plugged in a XJ cluster (4.0L) into my 88 (2.5L) and the tach did indeed work but the water temp and oil pressure did not,.. Now I am unsure if they worked before as I had not tested it before in another truck but the tach did work.

 

Hope that helps!

 

Did your old gauge cluster have dummy lights, or gauges?

 

 

Dummy lights ,.. I miss needles moving in front of me

 

Senders for the oil pressure and temp gauges are different from the dummy light ones. You need the gauge senders.

[Eagle]

Hello Boys

 

my big respect for your quick help many many thanks for it and all best greetings from Old Germany :bowdown: :bowdown: :bowdown:

 

Peter

 

Heißen Sie willkommen zum Comanche Klub Forum, übrigens.

[vaquaro]

Thanks for your answer but can you wright me what the right potentiometer on the back is.

 

Have you a picture ?

 

Peter

here's a link for you http://widetrackdrive.com/temp/mj/tach-pot.jpg :cheers:

That's a good photo. The potentiometer is the part labeled "J103C"

:wrench: Adjusting / setting the tachometer ; Before completely installing the new gauge pod , remove the speedometer from the pod ( screws on back side ) , plug in wiring harness while pod is just resting in dash opening . This will give you access to the tach adjusting screw ( while engine is running ) . Hook up a hand-held tach to the smaller (yellow) terminal under the hood between the battery and the firewall on the right side fender . Start the engine , adjust the new tach to match RPM of hand-held tach . Re-install speedo , and complete gauge pod into the dash . Hook up speedo cable , install new oil & temperaure senders if you have'nt done so already . :cheers: