It really depends on the type of tach you got. Most after market diesel tachs work off the stator lead from the alternator. astandard gasoline engine tach would be much harder to make work.

You want to keep your boost under 15 PSI you may want to use the extra protection of the switch over valve installed in the ALDA line found in 300D or SD models just incase your waste gate sticks

what bell housing set up are you using?

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Bob D.
Parrish, FL
1 SDL, 1 D, 1 TD, 1 Mog