JUST BOUGHT A 1987 MERC 150, SER # OA181592. THE TELL TALE IS VERY STRONG, CAN I ASSUME THE WATER PUMP IS OK? HOWEVER THE TELL TALE WATER SEEMS HOT. IF I UNDERSTAND CORRECTLY, THE TELL TALE IS THE LAST THING IN THE COOLING FLOW. HOW HOT SHOULD THIS GET, 140 DEG? (POST T-STAT TEMP). IF IT IS...