Neutral Safety Switch Help

[66mussang]

Purchased a TCI C4 "sizzler" transmission from Summit Racing and a neutral safety switch from NPD. My installer is having trouble getting the saftey switch to fit. Anyone ever had a problem here? Summit and TCI tech lines were no help.

 

[horse sence]

In the parts books it shows 65-67 and 68 - 69 and 70 -73 neutral safety switch as different ,I thought it was just the plug in but maybe not .What year is the case ? there will be a number on the case C5 at the start of the numbers would be 65 ,D o would be 70 and D3 would be 73 .Your switch will have a similar number .