hookin up a tach

[haynesn12]

i put a tach in my mj today and hooked it up to the green/white wire off the coil. the tach works and i get a reading but the rpm's seem low. is it possible i hooked into the wrong negative wire on the coil? any ideas?

 

[WB9YZU]

Many electronic tachs have a switch on the inside to select the number of cylinders your engine has. Make sure it's set correctly.
,Ron

 

[WB9YZU]

Many aftermarket electronic tachs have a switch on the inside to select the number of cylinders your engine has. Make sure it's set correctly.

,Ron

 

[Eagle]

I second what Zuki-Ron wrote

 

[haynesn12]

its on 6 cylinder i knew about the switch and wouldnt of asked if i hadnt checked that first. thanks though

 

[Lou]

i put a tach in my mj today and hooked it up to the green/white wire off the coil. the tach works and i get a reading but the rpm's seem low. is it possible i hooked into the wrong negative wire on the coil? any ideas?

GRN/WHT should be the correct wire.

What tach/model, etc.. ??

 

[haynesn12]

well maybe i am just not used to the way the engine tachs maybe if someone could tell me like where there's tachs at like 25 in 2nd, and differant speeds in diff gears. that might help

 

[firehazzard]

if you have a older cherokee w/o a tach you could just go the wrekers and find a cluster from a simmiler year and just plug it in everything will work the same as well as the tach.

 

[kg4bet]

My 91 XJ idles between 900-1000 rpm 1500 at 45 mph and 2100 at 75 mph with 235/75/15 tires.

Hope this helps

73's KG4BET

 

[firehazzard]

my cherokee idles at 250 rpm "i like it that way"

 

[jblaze5779]

my cherokee idles at 250 rpm "i like it that way"

and it still runs????

 

[haynesn12]

kg what gear are you in at 45 wit it at 1500, 4th or 5th?

 

[kg4bet]

I have the AW4 auto it's in 4th.

73's KG4BET