You can add a tachometer to your 2003 Itasca Spirit's Ford E-450 chassis by installing an aftermarket tach that connects to the ignition coil negative terminal or ECM. Autometer and VDO make excellent options that mount in a 2-1/16" gauge pod.
Starter relay is in engine bay fuse box on Ford 7.3 Godzilla. Starter staying engaged usually means stuck relay contacts. Replace relay - should be warranty covered on 2022 unit.
First oil analysis without history is difficult to interpret. Change oil, run 2-3K miles, sample again. Compare YOUR samples to establish trend. Metals may stabilize with fresh oil.
No spark usually caused by crank sensor, ignition module, or coil failure. Test systematically from sensor to coil.
Your 2015 Bounder's Ford V10 crate engine symptoms point to incomplete engine installation/tuning issues, not transmission problems. The shop likely hasn't properly completed the crate engine setup.
When your 1998 Bounder Ford 550 cranks but won't start, the most likely culprits are ignition components (spark plugs, coil packs, crankshaft position sensor) or fuel delivery issues despite hearing the fuel pump run. Start by checking for spark at the plugs, then verify fuel pressure and quality.
P0339 on 7.3 Godzilla is intermittent crank sensor signal. Since clearing fixed it, monitor for recurrence. Likely sensor beginning to fail - should be warranty covered at 27K miles.