M-4 as in weapon or fastener? Either way it should have minimal play.

Here is what I did with my gauges, stock gauges are crap.

[Linked Image]

That is boost and oil psi.


A brand spankin new 1973 series 3 Landy
OLIVE DRAB SWB, TURBO, IN ABOUT 36 PIECES
89 TROOPER, RESCUED FROM THE YARDS. (Down again)
05 TACOMA CREW SHORTY.