Thanks for all the replys i hav,nt been able to give it any real testing as its rush hour here , the gauge is showing just under the 90-100psi mark with semi -warmed up engine during tickover (800-1000k) which going off the info supplied sounds that something might be a bit wrong. I have used the sender unit which was already on the engine so im not sure if its got a compatability problem with the gauge , i do have the sender for the new gauge i thought i might get away with the one thats there though!...