boost gauge help

Okay I am stumped. I installed my boost gauge per the how to on the forum. I used fuse 10&12 on the inside and 21 in the engine compartment. When I went to start up, the boost gauge was working electrically but the car would not start. I took out the add-a fuse and the car starts. So I thought for some wierd reason the car knew I had replaced the 10 amp fuses with the 7.5s. So I swapped back to 10 amp and the gauge worked and the car started. I shut it down and started it again and the boost gauge doesnt work.
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Any Ideas??????

Oh the check engine light came on also.
 
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