Arcticat, the VDO Vision series boost gauge only goes to 30 psi.
Benson and JohnB, do not use the wastegate fitting location as a boost source... it will not be accurate for this purpose (per Cummins). Likewise, the cylinder head location near the map sensor is not a very good source either as it so near the source it causes gauge fluctuation in many gauges (also per Cummins).
The best place to use as a boost source (24v) is the aluminum intake manifold runner (i. e. , air horn). If you don't want to remove this piece from the engine to drill and tap the required hole you can accomplish this by removing the aftercooler hose just upstream (pertaining to intake air flow) of the manifold runner, covering the exposed tube with a plastic bag or equivalent, placing a clean, lint free shop rag downstream of where you are going to drill in the manifold runner (which will be near the upstream end), drilling and tapping same, removing chips and rag and replace the aftercooler hose. This is the easiest way... the "harder" way entails removal of the manifold runner to drill and tap at a location desired by you. [the manifold runner is easy to remove... I can have one off in about a minute or two] Of course, if you have a 12v engine a boost source is provided for you... near the downstream side of the manifold runner and just ahead of it.
Another option regarding the triple with tweeter A-pillar cover; purchase a new A-pillar replacement (WITHOUT tweeter) from Dodge for around $32. BENEFITS: no unsightly screws are required, the OE triple with tweeter A-pillar is preserved for resale (or whatever), the "laminated" mount will be stronger, and will experience less gauge clouding due to condensation.
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John Treibel
'98. 5 2500 QC 4x4 Sport, Glasstite Vision II, 285 BFG A/Ts on M/T Challengers, Warn 4X Boards, Mopar fender flares & tow hooks, NW Custom s/s-rubber mud flaps and accs. , Mag-Hytec diff. cover & trans. pan, Edelbrock IAS shocks, Reese Titan V hitch, SPA gauges (3), Dynamat, '00 Sport grille and headlights/PIAA Super White bulbs, PIAA Dual Sport 900 aux. lights, BD exh. brake, Amsoil Dual Remote Bypass, Optima Yellow Tops, DD3s and DD TTPM, Aeroquip AQP braided s/s fuel hoses, Banks High-Ram intake manifold and 14 cm2 turbine housing w/Big Head wastegate actuator, ATS 3-piece exh. man. , Banks 4" dia. s/s exh. sys. , DTT 93% TC, DTT custom tuned VB, BD modified trans. front pump (enhanced by DTT), Air Bulldog induction hood (with NACA ducts), plus MANY other trick modifications
[This message has been edited by John (edited 02-21-2001). ]