I think my Series 1 XJ6 4.2 might not have a thermostat fitted as it takes an age for the temp gauge to move and when it eventually does, it's no more than 1/4 of the way across the gauge.

Is this suspect and were should the gauge be once the engine is up to working temp?

 

I'm going to repost this in the S1/2/3 section so please reply there. Thanks.