comanche87-BRD Posted March 13, 2012 Share Posted March 13, 2012 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 Link to comment Share on other sites More sharing options...
mvusse Posted March 13, 2012 Share Posted March 13, 2012 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. Link to comment Share on other sites More sharing options...
JENSSEN Posted March 13, 2012 Share Posted March 13, 2012 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! Link to comment Share on other sites More sharing options...
Geonovast Posted March 13, 2012 Share Posted March 13, 2012 The 6 cylinder tach will work, but will read 2/3rds of actual rpm. You'll need to adjust the potentiometer on the back, Link to comment Share on other sites More sharing options...
comanche87-BRD Posted March 13, 2012 Author Share Posted March 13, 2012 Thanks for your answer but can you wright me what the right potentiometer on the back is. Have you a picture ? Peter Link to comment Share on other sites More sharing options...
vaquaro Posted March 13, 2012 Share Posted March 13, 2012 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: Link to comment Share on other sites More sharing options...
Eagle Posted March 13, 2012 Share Posted March 13, 2012 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" Link to comment Share on other sites More sharing options...
mvusse Posted March 13, 2012 Share Posted March 13, 2012 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? Link to comment Share on other sites More sharing options...
comanche87-BRD Posted March 14, 2012 Author Share Posted March 14, 2012 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 Link to comment Share on other sites More sharing options...
JENSSEN Posted March 14, 2012 Share Posted March 14, 2012 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 Link to comment Share on other sites More sharing options...
Geonovast Posted March 14, 2012 Share Posted March 14, 2012 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. Link to comment Share on other sites More sharing options...
Eagle Posted March 14, 2012 Share Posted March 14, 2012 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. Link to comment Share on other sites More sharing options...
vaquaro Posted March 15, 2012 Share Posted March 15, 2012 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: Link to comment Share on other sites More sharing options...
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