Aftermarket gauge install help needed

[Hummie2]

Don, do you have any pics of your tranny cooler, or know which model it was?

Hayden Rapid Cool #1-7511. Its supposed to be for motor homes towing over 10K lbs. I bypassed and plugged the radiator tank cooler altogather after Auggie gave me a "heads-up" on several splitting the heatexchanger in the radiator tank and dumping coolant into the trans and frying the tranny. Mine is out of warranty and I don't want to buy/rebuild a trans if I don't have to.

So far my trans runs about 1/2 to 2/3 the previous temps @80+F ambient and hasn't exceeded its previous normal temps on the hardest pulls. Coolant temps now stay well below 210. Remains to be seen if it will be sufficient when the ambient temp hits 100F and 95%RH. Might be necessary to add another in series similar to your setup Phil.

Here is the best pic I could get without pulling the grill: