so we had bad compression on the head that was on the jeep,picked up new head and are about to put it on when we noticed that one has a sending unit and one does not. do i need to worrie about it. i believe its the temp sending unit. i tryed to upload pics but it hates me. the hole is on the back of the head on the driver side.

 

which head came off the xj with or with not

 

the one we took off had the sensor

 

temp sender

 

your temp gauge aint gonna work

 

do i realy have to use it

 

only if you want to no what temp its running

 

so it wont stop the fan from coming on, thanks so much for your answers. is there a by pass you can use

 

no all it does is operate the gauge the coolant temp sensor operates the fan you really need the gauge what year xj is it

 

1990 limited

 

so its a renix 1987 thru 1990 are not 4.o HO motors im pretty sure the head your using is a HO head dont no if its the same bore wise

 

this has turned into a nightmare, so if its a ho head can we still use it or did we get scamed again

 

you should be fine it takes the same head gaskethttp://www.jeep4x4center.com/product...ber=53020754AB

 

so the old head is a 7120 and the new one is a 0331 im in trrouble now!!!!

 

no it will fit heres what i would do to have the gauge got to auto parts or jy and get a 91 and up thermostat housing with the outlet for the coolat temp sensor and get a adapter to use the factory renix sender that was in the head and just splice the wire longer to reach it in new location