I'm looking at fitting a boost gauge and following advice from a member of the forum was looking at routing the wiring through a box that is under the plenum chamber. To get to this you have to remove thye wiper arms. Easier said than done. It seems mine are siezed on. Undid the two 13mm bolts that hold the arm onto the splines and tried removing the wiper arms, its stuck solid. Tried wd40 and gently tapping with a hammer but no joy. Is there some other way of removing them i dont know about or are they generally siezed on? Failing this anyone else suggest a suitable point to pass the connections through to the boost gauge?