Gauge info???Tap size??

[keplinger78]

Hello,
I'm installing a 4" exhaust and changing out the head gaskets.Plan on get the Bullydog gauge panel,What size hole do I need to tap in the manifold for the boost and for the egt probe? I would like to do this now because they will be off so I don't have to do it later.I'll just put a plug in them till I can buy the gauges.

Thanks Tom K.

[sixnickel]

1/8" pipe for the boost guage and ether 1/8 or 1/4 pipe for the thermo coupling for the pyro . If you go 1/4" pipe you can always bush down to 1/8" pipe. I know Isspro uses 1/4" and S/W 1/8"