Re: water temp gauge kit for 57 Johnson? Home › Forum › Ask A Member › water temp gauge kit for 57 Johnson? › Re: water temp gauge kit for 57 Johnson? frankrUS Member - 1 Year (includes $3 online payment fee)Replies: 6715Topics: 51 September 10, 2018 at 6:33 pm #82577 There are gauge kits that use a sensor that goes under a head bolt. No drilling required. Research that.