I see the plug for the sending unit at back of head. Just not a place for it to connect. The temp gauge in the dash never worked when I bought this $700 XJ a few years back which is why I went aftermarket. I’ll get some pics of engine bay tomorrow so maybe you can better help me understand. I do know when I was chasing this issue, I had replaced the distributor cap and rotor button, bought for a 93, the button didn’t fit, but found a button for a 99 fit. Figured that was year of engine, so when I did this cam sensor fix, bought distributor for a 99 and plug was wrong. I’m just trying to figure out what dang year engine this is so when I need parts, I get the correct ones the first time. I thought most all XJ parts were interchangeable but I guess not when it comes to the engine