New tach issue

[93rinker260]

Hello everyone.
I have a 92 rinker fiesta vee 260 with a 5.7.
Bravo 2 and thunderbolt ignition. Bought a new set of Faria gouges ( not impressed) and the boat will not start with the new tach in. I put the old tach back in and she starts right up.
Does anyone have any ideas ???

 

[Chris1956]

You did buy the ones intended for Sterndrives, right? If that is so, I expect you are connecting the tach signal wire to the ground post of the tach. You might doublecheck your wiring.