What gauges/monitor for LOP operation

[Trippster]

I’m buying a 1975 337 that still has all the original engine instruments. It has a Garmin 430 with WAAS and we’re putting in a Garmin GTX345 transponder for ADS-B in and out. My question is what do those of you that utilize LOP use for your temperature readings? The JPI monitors are really nice, but do I need all of that? I’d like to get something worthwhile, but without breaking the bank or having the plane at the avionics shop for a month. Is there a reasonable gauge with good CHT & EGT readouts or is it best to spend the $$$ and get two EDM 830’s.

Thanks,

Tripp